KMS. U-52, Ironblood Shark

Submarine 3 (This creature enters the battlefield
with 3 oxygen counters on it. Remove 1 oxygen
counter: This creature is unblockable this turn)
When KMS. U-52, Ironblood Shark enters the battlefield, Ironblood creatures you control get
+1/+0 and gain vigilance until end of turn.
KMS. U-52, Ironblood Shark has +1/+0 for each
other Ironblood creature you control.