Altar of Dementia [Tempest] Wurm +1: Untap up to four

+1: Untap up to four target Forests

you may create a 1/1 white Bird creature token with flying

if you have 40 or more life

Set: Battle for Zendikar Prerelease Promos Type: Legendary Planeswalker — Gideon Rarity: Mythic Cost: {2}{W}{W} +1: Until end of turn

sacrifice Koskun Falls unless you tap an untapped creature you control

Altar of Dementia [Tempest] Wurm +1: Untap up to fourSet: Tempest Type: Artifact Rare Cost: {2} Sacrifice a creature: Target player puts a number of cards equal to the sacrificed creature's power from the top of their library into their graveyard. "It is not that you will go mad. It is that you will beg for madness." Volrath