Stronghold

Defender (This creature can't attack.) Shifting Wall enters the battlefield with X +1/+1 counters on it.

Shock deals 2 damage to any target.

Draw three cards, then discard a card.

Flying {U}: Change the target of target spell or ability that targets only Silver Wyvern. The new target must be a creature.

Skeleton Scavengers enters the battlefield with a +1/+1 counter on it. Pay {1} for each +1/+1 counter on Skeleton Scavengers: Regenerate Skeleton S...

{T}: Target creature with flying gets -1/-1 until end of turn.

Flying, vigilance

{T}: Add {G}.

{2}: Create a 1/1 colorless Sliver creature token.

Destroy target blocked creature.

Shadow (This creature can block or be blocked by only creatures with shadow.) Whenever Soltari Champion attacks, other creatures you control get +1...

Spike Breeder enters the battlefield with three +1/+1 counters on it. {2}, Remove a +1/+1 counter from Spike Breeder: Put a +1/+1 counter on target...

Spike Colony enters the battlefield with four +1/+1 counters on it. {2}, Remove a +1/+1 counter from Spike Colony: Put a +1/+1 counter on target cr...

Spike Feeder enters the battlefield with two +1/+1 counters on it. {2}, Remove a +1/+1 counter from Spike Feeder: Put a +1/+1 counter on target cre...

Spike Soldier enters the battlefield with three +1/+1 counters on it. {2}, Remove a +1/+1 counter from Spike Soldier: Put a +1/+1 counter on target...

Spike Worker enters the battlefield with two +1/+1 counters on it. {2}, Remove a +1/+1 counter from Spike Worker: Put a +1/+1 counter on target cre...

Flying At the beginning of your upkeep, sacrifice Spindrift Drake unless you pay {U}.

Whenever a Sliver becomes blocked, that Sliver gets +1/+1 until end of turn for each creature blocking it.

Flying {0}: The next 1 damage that would be dealt to Spirit en-Kor this turn is dealt to target creature you control instead.

Spitting Hydra enters the battlefield with four +1/+1 counters on it. {1}{R}, Remove a +1/+1 counter from Spitting Hydra: It deals 1 damage to targ...

{T}, Sacrifice a creature: Destroy target nonblack creature.

Other black creatures get -1/-1.

{T}: Target legendary creature gets +2/+2 until end of turn.