High Priest of Penance | Creature | Human Cleric | Whenever High Priest of Penance is dealt damage, you may destroy target nonland permanent. | Mark Zug
Mind Grind | Sorcery | | Each opponent reveals cards from the top of their library until they reveal X land cards, then puts all cards revealed this way into their graveyard. X can't be 0. | Daarken
Biomass Mutation | Instant | | Creatures you control have base power and toughness X/X until end of turn. | Dan Scott
Clan Defiance | Sorcery | | Choose one or more —
• Clan Defiance deals X damage to target creature with flying.
• Clan Defiance deals X damage to target creature without flying.
• Clan Defiance deals X damage to target player or planeswalker. | Daarken
Signal the Clans | Instant | | Search your library for three creature cards and reveal them. If you reveal three cards with different names, choose one of them at random and put that card into your hand. Shuffle the rest into your library. | Dave Kendall