Flat Cavern
Land (Rare)

At the beginning of your upkeep, Flat Cavern deals 2 damage to target creature you control.

When Flat Cavern enters the battlefield, put a land you control on the bottom of its owner's library.

Tap: Add WB to your mana pool.

W, Tap: Target Bird gets +1/+1 until end of turn.

Steve Prescott