Mystic Fields
Land-Plains Island (Rare)

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

Mystic Fields enters the battlefield tapped unless you reveal an artifact creature card from your hand.

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

W, Tap: Target blocking creature gets +0/+2 until end of turn.

Mark Walker