Copperline Island
Land (Rare)

At the beginning of your end step, if you didn't cast any spells this turn, Copperline Island deals 1 damage to you.

Tap: Add 1 to your mana pool.

Tap: Add G or U to your mana pool. Each opponent gains 1 life.

GU: Copperline Island becomes a 2/1 green and blue Elf creature until end of turn. It's still a land.

Steve Chan