Altar of Dementia [Tempest]

Altar of Dementia [Tempest]Set: Tempest Type: Artifact Rarity: Rare Cost: {2} Sacrifice a creature: Target player mills cards equal to the sacrificed creature's power. "It is not that you will go mad. It is that you will beg for madness." Volrath

Set: Amonkhet Invocations Type: Instant Rarity: Mythic Cost: {U} Change the target of target spell with a single target unless that spell's controller pays {2}

an ordinary grove becomes a bastion to turn spells and break armies

"The Rime of the Ancient Mariner"

and gains hexproof

Set: Odyssey Type: Enchantment Rarity: Uncommon Cost: {1}{U} When a player casts a spell

that player sacrifices all but that many permanents

"Take a quiet moment to reflect on your sins

Set: From the Vault: Exiled Type: Sorcery Rarity: Mythic Cost: {2}{U} As an additional cost to cast this spell

−3: Destroy target artifact

Whenever you tap a land for mana

Set: Ravnica: City of Guilds Type: Artifact Rarity: Rare Cost: {3} Whenever a nonartifact permanent enters the battlefield under your control

It can't be blocked this turn