Thief of Sanity [Guilds of Ravnica Prerelease Promos]Set: Guilds of Ravnica Prerelease Promos Type: Creature Specter Rarity: Rare Cost: {1}{U}{B} Flying Whenever Thief of Sanity deals combat damage to a player, look at the top three cards of that player's library, exile one of them face down, then put the rest into their graveyard. You may look at and cast that card for as long as it remains exiled, and you may spend mana as though it were mana of any type to cast that spell.

Set: Beta Edition Type: Land — Island Mountain Rarity: Rare ({T}: Add {U} or {R}

Set: Diamond & Pearl: Legends Awakened Type: Psychic Rarity: Common Retreat cost: Colorless

It seems to regard me as its child and will not let me leave

Set: Miscellaneous Cards Type: Water Rarity: Promo Retreat cost: Colorless

and the land itself went mad

"The essence of every world

Set: Magic 2012 Type: Land Rarity: Rare Sunpetal Grove enters the battlefield tapped unless you control a Forest or a Plains

Set: Sun & Moon: Crimson Invasion Type: Colorless Rarity: Ultra Rare Retreat cost: Colorless

Set: Gatecrash Type: Land — Mountain Plains Rarity: Rare ({T}: Add {R} or {W}

Metal Rarity: Promo Retreat cost: Colorless

Set: Gatecrash Type: Creature — Elf Wizard Rarity: Mythic Cost: {2}{G}{U} Each other creature you control enters the battlefield with a number of additional +1/+1 counters on it equal to Master Biomancer's power and as a Mutant in addition to its other types

When a creature put onto the battlefield with this scheme dies