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

: Add  or to your mana pool.

Sacrifice Havenwood Ampitheater: Add  or to your mana pool.

: Havenwood Ampitheater becomes a 2/2 red and green Squirrel Treefolk creature with trample until end of turn. It's still a land.