Forbidding Conclave
Land-Plains Island (Rare)

(Tap: Add W or U to your mana pool.)

Forbidding Conclave enters the battlefield tapped unless you control an enchantment.

W, Tap, Sacrifice Forbidding Conclave: Prevent all combat damage that would be dealt this turn.

2, Tap: Target land becomes a 3/3 blue Crab creature until end of turn. It's still a land.

Steve Chippy