Jace, the Mind Sculptor [From the Vault: Twenty] Merfolk Sacrifice Powder Keg: Destroy each

Sacrifice Powder Keg: Destroy each artifact and creature with mana value equal to the number of fuse counters on Powder Keg

Set: Alliances Type: Artifact Creature — Wall Rarity: Uncommon Cost: {0} Defender

the castle's walls mark the only place on Kamigawa where no kami has ever set foot

then shuffle your library

you can't be attacked except by creatures with flying and/or islandwalk

Jace, the Mind Sculptor [From the Vault: Twenty] Merfolk Sacrifice Powder Keg: Destroy eachSet: From the Vault: Twenty Type: Legendary Planeswalker Jace Rarity: Mythic Cost: {2}{U}{U} +2: Look at the top card of target player's library. You may put that card on the bottom of that player's library. 0: Draw three cards, then put two cards from your hand on top of your library in any order. 1: Return target creature to its owner's hand. 12: Exile all cards from target player's library, then that player shuffles their hand into their library.