Stronghold

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

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

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...

Defender (This creature can't attack.) First strike