I'm not here to tell you what you should and shouldn't do, but rather what I have experienced playing a GW deck, and frequently playing against a Sisay deck.
There are a couple of good legendary ramp spells that could be used if your deck if you worry that your deck isn't fast enough. Azusa, Lost but Seeking is pretty strong, and is a good way to power out lands in the early turns, but does become weaker in the later turns if you are low on lands. Also, having a lot of Legendary lands really helps to ensure a constant stream on one drops.
Here's a list of some good Legendary Lands:
Granted some of these cards are pretty weak, they are just something to keep in mind. Another option, for a deck with a lot of artifacts is Mox Opal. It probably won't often be active until pretty late in the game, but is Legendary, and fixes any colour of mana.
Seedborn Muse is probably the best non-Legendary green creature in Commander at the moment, and allows for multiple activation of Sisay in a turn. The one downside is that it draws a lot of hate.Vorinclex, Voice of Hunger is an option for this deck. Now he's certainly not bad, but he is a bit of a griefer. I hate him, only because I am not the biggest fan of such hateful cards, but then again it also has to do with my play group who has issued a soft ban on him.
I really do like your deck, and I wish you luck in the future with it.
I've never been a huge fan of the Kaldra cards; seems like it's going to take you to long to get it out. If you were to cut them, I think that Kataki, War's Wage deserves a spot. I also loved Reki, the History of Kamigawa in my Sisay deck.
I enjoy this deck a lot and am always on the lookout for ways to make this deck more fun.
Comments and suggestions always appreciated
(*) Denotes Legendary
1 Captain Sisay (*)
Lands - 34
1 Command Tower
1 Deserted Temple
1 Eiganjo Castle (*)
1 Elfhame pPalace
11 Forest
1 Kor Haven (*)
1 Okina, Temple to the Grandfathers (*)
1 Pendelhaven (*)
11 Plains
1 Strip Mine
1 Temple of the False God
1 Untaidake, the Cloud Keeper (*)
1 Vec Township
1 Yavimaya Hollow (*)
1 Acidic Slime
1 Atalya, Samite Master (*)
1 Avatar of Hope
1 Commander Eesha
1 Crovax, Ascendant Hero (*)
1 Darksteel Myr
1 Elesh Norn, Grand Cenobite (*)
1 Gerrard Capashen (*)
1 Glissa Sunseeker (*)
1 Kozilek, Butcher of Truth (*)
1 Mangara of Corondor (*)
1 Melira, Sylvok Outcast (*)
1 Northern Paladin
1 Orim, Samite healer (*)
1 Oriss, Samite Guardian (*)
1 Palladium Myr
1 Reya Dawnbringer (*)
1 Rhys the Redeemed (*)
1 Sanctum Gargoyle
1 Solemn Simulacrum
1 Southern Paladin
1 Steward of Valeron
1 Sylvok Replica
1 Thriss, Nantuko Primus (*)
1 Utopia Tree
1 Yavimaya Elder
1 Mindslaver (*)
1 Planar Portal
1 Predator, Flagship (*)
1 Sensei's Divining Top
1 Shell of the Last Kappa (*)
1 Sword of the Chosen (*)
1 Unwinding Clock
1 Vedalken Orrery
1 Darksteel Ingot
1 Everflowing Chalice
1 Sisay's Ring
1 Sol Ring
1 Sphere of the Suns
1 Thran Dynamo
1 Wildfield Borderpost
1 Basilisk Collar
1 Helm of Kaldra (*)
1 Lightning Greaves
1 Shield of Kaldra (*)
1 Swiftfoot Boots
1 Sword of Kaldra (*)
1 Umezawa's jitte (*)
1 Whispersilk Cloak
Enchantments (Creature) -1
1 Armadillo Cloak
Enchantments -6
1 Day of Destiny (*)
1 Force Bubble
1 Nevermore
1 Oblivion Ring
1 Quest for Renewal
1 Rite of passage
1 Debt of Loyalty
1 Disenchant
1 Gerrard's Command
1 Repopulate
1 Creeping Mold
1 Nature's Spiral
1 Resurrection
- EDH
WG Sisay
There are a couple of good legendary ramp spells that could be used if your deck if you worry that your deck isn't fast enough. Azusa, Lost but Seeking is pretty strong, and is a good way to power out lands in the early turns, but does become weaker in the later turns if you are low on lands. Also, having a lot of Legendary lands really helps to ensure a constant stream on one drops.
Here's a list of some good Legendary Lands:
Granted some of these cards are pretty weak, they are just something to keep in mind. Another option, for a deck with a lot of artifacts is Mox Opal. It probably won't often be active until pretty late in the game, but is Legendary, and fixes any colour of mana.
Seedborn Muse is probably the best non-Legendary green creature in Commander at the moment, and allows for multiple activation of Sisay in a turn. The one downside is that it draws a lot of hate.Vorinclex, Voice of Hunger is an option for this deck. Now he's certainly not bad, but he is a bit of a griefer. I hate him, only because I am not the biggest fan of such hateful cards, but then again it also has to do with my play group who has issued a soft ban on him.
I really do like your deck, and I wish you luck in the future with it.
WUB Sharuum the Hegemon, the Destroyer of Darksteel
BGW Teneb, the Harvester, my Pimped Out Reanimator
GUB The Mimeoplasm Ooze-Mill
GWU Rafiq the Exalted