Boom // Bust [Planar Chaos] Elf Set: Kaladesh Inventions Type: Artifact

Set: Kaladesh Inventions Type: Artifact Rarity: Mythic Cost: {1} As Black Vise enters the battlefield

If an opponent would begin an extra turn

change Halfdane's base power and toughness to the power and toughness of target creature other than Halfdane until the end of your next upkeep

Y is equal to X or to enchanted creature's toughness minus 1

Exile it at the beginning of the next end step

Boom // Bust [Planar Chaos] Elf Set: Kaladesh Inventions Type: ArtifactSet: Planar Chaos Type: Sorcery Sorcery Rarity: Rare Cost: {1}{R} {5}{R} Destroy target land you control and target land you don't control. Reverse Type: Sorcery Destroy all lands.