NOTE --- My sideboarding is based on my own experiences and my LGS Meta: lots of Jund, Nahiri, and flavor of the week combo (was Dredge, now Scapeshift) -- I am unsure if it's optimal ---
The Infect matchup is a toss-up --- board out Mutagenics and board in removal/IOK and race. Take care to keep track of fetchlands to avoid Dryad Arbor blow-outs. Our creatures' are stronger than theirs, and they generally have only one threat on the board, so we can blow them out at any point.
---Prioritize Blighted Agent and their counter-spells with discard -- their only removal option (Dismember) advances our own game-plan and therefore it's a good idea to make an effort to stick two threats and force them into a tough spot.
Affinity I believe we a favored -- their creatures are dinky and they don't have a lot of ways to kill our creatures. A TBR on a Death's Shadow is usually game-over.
--- Board out Mutagenics and a couple cyclers, board in anti-artifact cards and removal (Pyroclasm).
Jund is fairly hard -- As a lightening bolt deck they can burn you out from 8 health or so quickly. Prioritize hands with multiple threats and take care to not carelessly play pumps/TBR into open mana for the 2 for 1.
---I board out 3x discard, 2x Become Immense, 4x mutagenic for 3x Lingering souls, 2x Hooting Mandrills,2x Path to Exile, 1x Traverse the Ulvenwald, and 1x Forest (to help cast Lingering Souls)
For reference, my sideboard is:
3x Lingering Souls
2x Hooting Mandrills
2x Path
2x Pyroclasm
1x Dismember
1x Stony Silence
1x Ancient Grudge
1x Natural State
1x Traverse the Ulvenwald
1x Forest
Candidly speaking I moved from Infect to Death's Shadow and now have both decks. I think Death's Shadow is the overall stronger of the two. However, it (Death's Shadow) is fairly complicated to play ( I have a bad habit of getting burned out by Bolt decks from 7-8 life on turn 3-4 or improperly sequencing interaction). I get frustrated with the deck sometimes as there are a lot more nonsense hands ( 1 Steppe Lynx, 1 Death's Shadow, 2 TBR, 1 Mutagenic, 1 Wooded Foothills, I Thoughtseize) than you would experience with Infect. Sometimes I feel the deck is trying to do to much all at once, being a fast-aggro/combo four-color deck with a black win-con creature, green and red combat tricks, and white sideboard cards. The manabase is difficult to manage, particularly when you couple a card like Wild Nacatl with a card like Thoughtseize. It is, however, FUN and rewarding and I'd recommend it to anyone with a lot of patience and the will to take a good many licks.
One thing I really like about Death's Shadow in comparison to Infect is that match-ups against creature-based decks are a lot easier with stronger, bigger, and more resilient threats. A sequence of Wild Nacatl into Thoughtseize and Death's Shadow is hard for most of these decks to overcome
The Death and Taxes match-up is actually really difficult in my experience -- before Death's Shadow became a known entity they didn't know how to play against us. Now, in my experience, they prioritize attacking our fragile manabase (I've had my T1 land Ghost Quartered many times) and follow it up with slow beatdowns. Still unsure how to sideboard against them.
As has been stated this gob does not have to attack. If you are worried about losing the gobs you have already simply play it on your second main phase. In Standard there isn't a goblin lord but there is a "lord" effect in Standard for all read creatures which conveniently lands the turn after this guy. Also there are too gobs that can be used as combat tricks or creatures to help round things out and surprise Courser of Kruphix into a bad block. I'm not saying it's the greatest but for those who want to play gobs for the sake of gobs in standard the tools are there.
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The Infect matchup is a toss-up --- board out Mutagenics and board in removal/IOK and race. Take care to keep track of fetchlands to avoid Dryad Arbor blow-outs. Our creatures' are stronger than theirs, and they generally have only one threat on the board, so we can blow them out at any point.
---Prioritize Blighted Agent and their counter-spells with discard -- their only removal option (Dismember) advances our own game-plan and therefore it's a good idea to make an effort to stick two threats and force them into a tough spot.
Affinity I believe we a favored -- their creatures are dinky and they don't have a lot of ways to kill our creatures. A TBR on a Death's Shadow is usually game-over.
--- Board out Mutagenics and a couple cyclers, board in anti-artifact cards and removal (Pyroclasm).
Jund is fairly hard -- As a lightening bolt deck they can burn you out from 8 health or so quickly. Prioritize hands with multiple threats and take care to not carelessly play pumps/TBR into open mana for the 2 for 1.
---I board out 3x discard, 2x Become Immense, 4x mutagenic for 3x Lingering souls, 2x Hooting Mandrills,2x Path to Exile, 1x Traverse the Ulvenwald, and 1x Forest (to help cast Lingering Souls)
For reference, my sideboard is:
3x Lingering Souls
2x Hooting Mandrills
2x Path
2x Pyroclasm
1x Dismember
1x Stony Silence
1x Ancient Grudge
1x Natural State
1x Traverse the Ulvenwald
1x Forest
Candidly speaking I moved from Infect to Death's Shadow and now have both decks. I think Death's Shadow is the overall stronger of the two. However, it (Death's Shadow) is fairly complicated to play ( I have a bad habit of getting burned out by Bolt decks from 7-8 life on turn 3-4 or improperly sequencing interaction). I get frustrated with the deck sometimes as there are a lot more nonsense hands ( 1 Steppe Lynx, 1 Death's Shadow, 2 TBR, 1 Mutagenic, 1 Wooded Foothills, I Thoughtseize) than you would experience with Infect. Sometimes I feel the deck is trying to do to much all at once, being a fast-aggro/combo four-color deck with a black win-con creature, green and red combat tricks, and white sideboard cards. The manabase is difficult to manage, particularly when you couple a card like Wild Nacatl with a card like Thoughtseize. It is, however, FUN and rewarding and I'd recommend it to anyone with a lot of patience and the will to take a good many licks.
One thing I really like about Death's Shadow in comparison to Infect is that match-ups against creature-based decks are a lot easier with stronger, bigger, and more resilient threats. A sequence of Wild Nacatl into Thoughtseize and Death's Shadow is hard for most of these decks to overcome
The Death and Taxes match-up is actually really difficult in my experience -- before Death's Shadow became a known entity they didn't know how to play against us. Now, in my experience, they prioritize attacking our fragile manabase (I've had my T1 land Ghost Quartered many times) and follow it up with slow beatdowns. Still unsure how to sideboard against them.
Cheers.