Thousand-Year Elixir is another way (besides the other haste-granting cards in the deck) to let Krenko activate right away, and untaps him for an extra activation each turn as well.
I see you have Thornbite Staff for infinite shenanigans. You might also want to throw in a few more cards to go infinite in various ways. The following list is for my Wort, Boggart Auntie deck, so also includes a few black cards, but for the most part can be done in mono-red goblins. Also note, Sword of the Paruns can be included as a substitute or functional copy of Umbral Mantle. Most of the cards are useful in thier own right; Ashnod's Altar, Cloudstone Curio, Mana Echoes, Nim Deathmantle, etc. give a lot of value even when they are not going infinite.
Land Destruction
Kiki-Jiki/Splinter Twin + Goblin Settler + Thornbite Staff + Sac outlet = Mass land destruction
Goblin Settler + Nim Deathmantle + Sac outlet + Mana Echoes + 4 other goblins + 4 mana = Mass Land Destruction
Goblin Sharpshooter + Kormus Bell + Urborg, Tomb of Yawgmoth = Mass Land Destruction
Goblin Settler + Goblin Wizard + Umbral Mantle + Mana Echoes + Cloudstone Curio + 2 other goblins and 1 in hand = Mass Land Destruction Infinite Damage
Kiki-jiki + Lightning Crafter + Sac outlet = Infinite Damage
Kiki-jiki + Lightning Crafter + Goblin Sharpshooter = Infinite Damage
Goblin Sharpshooter + Splinter Twin + any 1 toughness creature in play/sac outlet = Infinite Damage
Kiki-Jiki + Thornbite Staff + Goblin Sharpshooter + any 1 tough creature/Sac outlet = Infinite Damage
Kiki-Jiki/Splinter Twin + Thornbite Staff + Murderous Redcap + Sac outlet = Infinite Damage
Kiki-Jiki/Splinter Twin + Thornbite Staff + Mogg Fanatic = Infinite Damage
Necrotic Ooze + Kiki-Jiki in graveyard + Mogg Fanatic in graveyard = Infinite Damage
Any Infinite Token combo + Goblin Bombardment = Infinite Damage
Kiki-Jiki + Boggart Mob + (Boggart Shenanigans + Sac Outlet)/Goblin Bombardment = Infinite Damage
Mogg Fanatic/Murderous Redcap + Mana Echoes + Nim Deathmantle + 3 other goblins = Infinite Damage
Murderous Redcap + Goblin Wizard + Umbral Mantle + Mana Echoes + Cloudstone Curio + 2 other goblins and 1 in hand = Infinite Damage Infinite Tokens
Necrotic Ooze + Kiki-Jiki in graveyard = Infinite Tokens
Krenko + Umbral Mantle + Ashnod’s Altar + 2 other goblins = Infinite Tokens
Krenko/Kiki-Jiki + Mana Echoes + Umbral Mantle + 2 other goblins = Infinite Tokens
Krenko + Thornbite Staff + Sac outlet = Infinite Tokens
Weirding Shaman/ Goblin Warrens + Mana Echoes + Gemstone Array + 2 goblins = Infinite Tokens
Goblin Marshal/Beetleback Chief/Mogg War Marshal/Siege-gang Commander + Nim Deathmantle + Ashnod’s Altar = Infinite Tokens
Goblin Marshal/Beetleback Chief/Mogg War Marshal/Siege-gang Commander + Kiki-Jiki/Splinter Twin + Thornbite Staff + Sac Outlet = Infinite Tokens
Krenko + Skirk Prospector + Aggravated Assault + any 4 goblins = Infinite Tokens (and Infinite attacks with a haste enabler)
Kiki-Jiki + Mana Echoes + Nim Deathmantle + Sac outlet + 2 other goblins = Infinite Tokens
Any Goblin + Kiki-Jiki/Splinter Twin + Illusionist’s Bracers + Thornbite Staff + Sac outlet = Infinite Tokens
Goblin Wizard + Thornbite Staff + Goblin Marshal/Beetleback Chief/Mogg War Marshal/Siege-gang + Cloudstone Curio + sac outlet = Tutor every Goblin and Play them
Goblin Matron + Kiki-Jiki/spliner twin + Thornbite Staff + Skirk Prospector
Moggcatchcer + Mana Echoes + Umbral Mantle + 6 goblins Infinite Bounce Kiki-Jiki/Splinter twin + Thornbite Staff + Stingscourger + Sac outlet = Bounce all opposing creatures to owner's hand.
Stingscourger + Nim Deathmantle + Mana Echoes + Sac Outlet + 3 other goblins = Bounce all opposing creatures to owner's hand. Draw Your Deck
Kiki-Jiki/Splinter twin + Thornbite Staff + Rummaging Goblin + sac outlet = draw and discard goblins until you get Living Death/Patriarch’s Bidding. Hopefully, you have Goblin Warchief/Goblin Chieftan in play or in the graveyard. Alternatively, Anger in the graveyard works if you use Patriarch’s Bidding. Swing with lots of hasty goblins. Infinite ETB Triggers
ETB Goblin + Nim Deathmantle + Mana Echoes + Sac outlet + 3 other goblins
ETB Goblin + Goblin Wizard + Umbral Mantle + Mana Echoes + Cloudstone Curio + 1 other goblins and 1 in hand
ETB Goblin + Kiki-Jiki/Splinter twin + Thornbite Staff + Sac outlet
ETB Goblin + Kiki-Jiki + Mana Echoes + Nim Deathmantle + Sac outlet + 2 other goblins
ETB Goblin + Kiki-Jiki/Splinter twin + Umbral Mantle + 1 other goblin
Current EDH Generals: WAvacyn, Angel of Hope|UAzami, Lady of Scrolls|B| Ob Nixilis, the Fallen|R Daretti, Scrap Savant|GEzuri, Renegade Leader|WUBrago, King Eternal|UBGrimgrin, Corpse-born|BR Wort, Boggart Auntie|RGUlasht, the Hate Seed|GW Captain Sisay|WBGhost Council of Orzhova|BGGlissa, the Traitor|GUExperiment Kraj|URMelek, Izzet Paragon RWJor Kadeen, the Prevailer|WBRKaalia of the Vast|GWBGhave, Guru of Spores|UBRMarchesa, the Black Rose
Retired WDarien, King of Kjeldor|RJaya Ballard, Task Mage|RNorin the Wary|GBMomir Vig, Simic Visionary|WUBRGSliver Overlord
As an aggro deck, I would try to include some form of disruption so you can keep up with other decks on the later turns. In the very least, Stranglehold and Blood Moon (Which is also good with Goblin King)
As for tutors, you're a little SoL in mono-red, but Gamble is pretty good. Especially if you have Squee, Goblin Nabob, Anger or other outlets. Imperial Recruiter is insane in your deck, but the price tag keeps it out of reach for a lot of people. I would definately look at Moggcatcher, despite not being a goblin himself.
Edit: As a minor side note, it would make it easier for people suggesting cards if the sections were in alphabetical order.
Edit #2: Goblin Settler is also better than other LD goblins, but again that price tag.
Edit #3: For removal, the on theme and awesome Mogg Infestation!
I would recommend Valakut, the Molten Pinnacle to you, since you're running heavy Mountains as it is. Also, Gauntlet of Power will give you that push into late-game mana in the early mid-game, allowing you to a) combo off or b) play game-ending bombs.
30 Mountain
1 Goblin Burrows
1 Forgotten Cave
1 Cavern of Souls
1 Teetering Peaks
// Creatures
1 Kiki-Jiki, Mirror Breaker
1 Goblin Pyromancer
1 Goblin Ringleader
1 Skirk Fire Marshal
1 Siege-Gang Commander
1 Voracious Dragon
1 Moggcatcher
1 Lightning Crafter
1 Goblin Chieftain
1 Gempalm Incinerator
1 Zo-Zu the Punisher
1 Goblin Matron
1 Goblin Replica
1 Goblin Sharpshooter
1 Ib Halfheart, Goblin Tactician
1 Warren Instigator
1 Goblin Lackey
1 Goblin King
1 Mogg War Marshal
1 Goblin Warchief
1 Sensation Gorger
1 Goblin Recruiter
1 Stingscourger
1 Sparksmith
1 Goblin Tinkerer
1 Goblin Piledriver
1 Bloodmark Mentor
1 Goblin Lookout
1 Goblin Chirurgeon
1 Mogg Raider
1 Frenzied Goblin
1 Goblin Sledder
1 Skirk Prospector
1 Clickslither
1 Goblin Marshal
1 Arms Dealer
1 Goblin Ruinblaster
1 Beetleback Chief
1 Horde of Boggarts
1 Spikeshot Elder
1 Tuktuk Scrapper
1 Spikeshot Goblin
1 Skirk Drill Sergeant
1 Reckless One
1 Goblin Wardriver
1 Goblin War Strike
1 Shared Animosity
1 Lightning Greaves
1 Goblin Bombardment
1 Eldrazi Monument
1 Skullclamp
1 Goblin Grenade
1 Door of Destinies
1 Sol Ring
1 Boggart Shenanigans
1 Goblin Charbelcher
1 In the Web of War
1 Rage Reflection
1 Gratuitous Violence
1 Warp World
1 Swiftfoot Boots
1 Crystal Ball
1 Thornbite Staff
1 Quest for the Goblin Lord
1 Cauldron of Souls
// General
1 Krenko, Mob Boss
So I'm looking to add just a bit of the following: card draw, recursion, removal. Just a bit, as I don't want to cut too many Goblins.
Thoughts and suggestions please. Thank you!
For recursion... Squee, Goblin Nabob seems pretty on-theme, doesn't he?
R Citizen Cane (Feldon of the Third Path)
Land Destruction
Kiki-Jiki/Splinter Twin + Goblin Settler + Thornbite Staff + Sac outlet = Mass land destruction
Goblin Settler + Nim Deathmantle + Sac outlet + Mana Echoes + 4 other goblins + 4 mana = Mass Land Destruction
Goblin Sharpshooter + Kormus Bell + Urborg, Tomb of Yawgmoth = Mass Land Destruction
Goblin Settler + Goblin Wizard + Umbral Mantle + Mana Echoes + Cloudstone Curio + 2 other goblins and 1 in hand = Mass Land Destruction
Infinite Damage
Kiki-jiki + Lightning Crafter + Sac outlet = Infinite Damage
Kiki-jiki + Lightning Crafter + Goblin Sharpshooter = Infinite Damage
Goblin Sharpshooter + Splinter Twin + any 1 toughness creature in play/sac outlet = Infinite Damage
Kiki-Jiki + Thornbite Staff + Goblin Sharpshooter + any 1 tough creature/Sac outlet = Infinite Damage
Kiki-Jiki/Splinter Twin + Thornbite Staff + Murderous Redcap + Sac outlet = Infinite Damage
Kiki-Jiki/Splinter Twin + Thornbite Staff + Mogg Fanatic = Infinite Damage
Necrotic Ooze + Kiki-Jiki in graveyard + Mogg Fanatic in graveyard = Infinite Damage
Any Infinite Token combo + Goblin Bombardment = Infinite Damage
Kiki-Jiki + Boggart Mob + (Boggart Shenanigans + Sac Outlet)/Goblin Bombardment = Infinite Damage
Mogg Fanatic/Murderous Redcap + Mana Echoes + Nim Deathmantle + 3 other goblins = Infinite Damage
Murderous Redcap + Goblin Wizard + Umbral Mantle + Mana Echoes + Cloudstone Curio + 2 other goblins and 1 in hand = Infinite Damage
Infinite Tokens
Necrotic Ooze + Kiki-Jiki in graveyard = Infinite Tokens
Krenko + Umbral Mantle + Ashnod’s Altar + 2 other goblins = Infinite Tokens
Krenko/Kiki-Jiki + Mana Echoes + Umbral Mantle + 2 other goblins = Infinite Tokens
Krenko + Thornbite Staff + Sac outlet = Infinite Tokens
Weirding Shaman/ Goblin Warrens + Mana Echoes + Gemstone Array + 2 goblins = Infinite Tokens
Goblin Marshal/Beetleback Chief/Mogg War Marshal/Siege-gang Commander + Nim Deathmantle + Ashnod’s Altar = Infinite Tokens
Goblin Marshal/Beetleback Chief/Mogg War Marshal/Siege-gang Commander + Kiki-Jiki/Splinter Twin + Thornbite Staff + Sac Outlet = Infinite Tokens
Krenko + Skirk Prospector + Aggravated Assault + any 4 goblins = Infinite Tokens (and Infinite attacks with a haste enabler)
Kiki-Jiki + Mana Echoes + Nim Deathmantle + Sac outlet + 2 other goblins = Infinite Tokens
Any Goblin + Kiki-Jiki/Splinter Twin + Illusionist’s Bracers + Thornbite Staff + Sac outlet = Infinite Tokens
Goblin Wizard + Thornbite Staff + Goblin Marshal/Beetleback Chief/Mogg War Marshal/Siege-gang + Cloudstone Curio + sac outlet =
Tutor every Goblin and Play them
Goblin Matron + Kiki-Jiki/spliner twin + Thornbite Staff + Skirk Prospector
Moggcatchcer + Mana Echoes + Umbral Mantle + 6 goblins
Infinite Bounce
Kiki-Jiki/Splinter twin + Thornbite Staff + Stingscourger + Sac outlet = Bounce all opposing creatures to owner's hand.
Stingscourger + Nim Deathmantle + Mana Echoes + Sac Outlet + 3 other goblins = Bounce all opposing creatures to owner's hand.
Draw Your Deck
Kiki-Jiki/Splinter twin + Thornbite Staff + Rummaging Goblin + sac outlet = draw and discard goblins until you get Living Death/Patriarch’s Bidding. Hopefully, you have Goblin Warchief/Goblin Chieftan in play or in the graveyard. Alternatively, Anger in the graveyard works if you use Patriarch’s Bidding. Swing with lots of hasty goblins.
Infinite ETB Triggers
ETB Goblin + Nim Deathmantle + Mana Echoes + Sac outlet + 3 other goblins
ETB Goblin + Goblin Wizard + Umbral Mantle + Mana Echoes + Cloudstone Curio + 1 other goblins and 1 in hand
ETB Goblin + Kiki-Jiki/Splinter twin + Thornbite Staff + Sac outlet
ETB Goblin + Kiki-Jiki + Mana Echoes + Nim Deathmantle + Sac outlet + 2 other goblins
ETB Goblin + Kiki-Jiki/Splinter twin + Umbral Mantle + 1 other goblin
W Avacyn, Angel of Hope|U Azami, Lady of Scrolls|B | Ob Nixilis, the Fallen|R Daretti, Scrap Savant|G Ezuri, Renegade Leader|WUBrago, King Eternal|UB Grimgrin, Corpse-born|BR Wort, Boggart Auntie|RG Ulasht, the Hate Seed|GW Captain Sisay|WB Ghost Council of Orzhova|BG Glissa, the Traitor|GU Experiment Kraj|UR Melek, Izzet Paragon
RW Jor Kadeen, the Prevailer|WBR Kaalia of the Vast|GWB Ghave, Guru of Spores|UBR Marchesa, the Black Rose
Retired
WDarien, King of Kjeldor|R Jaya Ballard, Task Mage|R Norin the Wary|GB Momir Vig, Simic Visionary|WUBRG Sliver Overlord
As for tutors, you're a little SoL in mono-red, but Gamble is pretty good. Especially if you have Squee, Goblin Nabob, Anger or other outlets. Imperial Recruiter is insane in your deck, but the price tag keeps it out of reach for a lot of people. I would definately look at Moggcatcher, despite not being a goblin himself.
Other than what you aleady have, I like Mind's Eye and Staff of Nin for card draw. You could also switch to Snow-Covered Mountains and run Scrying Sheets. Memory Jar is also really good here when you dump your hand early, and then you can even run the on theme Goblin Welder.
And you can always run the classic Wheel of Fortune and now Reforge the Soul.
Edit: As a minor side note, it would make it easier for people suggesting cards if the sections were in alphabetical order.
Edit #2: Goblin Settler is also better than other LD goblins, but again that price tag.
Edit #3: For removal, the on theme and awesome Mogg Infestation!
Also consider tears of rage and/or burn at the stake to end games.
R Feldon of the Third Path EDH R
X Kozilek, the Great Distortion EDH X
B Sidisi Ad Nauseam Combo EDH B