Overlord of the Boilerbilges (Japan Showcase) (Japanese) [Duskmourn: House of Horror] Magic Player Rewards 2006 An underground paradise

An underground paradise

Set: Secret Lair Drop Series Type: Sorcery Rarity: Rare Cost: {3}{R}{R} Target creature you control deals damage equal to its power to each other creature and each opponent

Shatterskull Pass is a pretty distant second

Set: Amonkhet Invocations Type: Enchantment Rarity: Mythic Cost: {1}{B}{B} {B}

Set: Core Set 2020 Promos Type: Creature — Elemental Knight Rarity: Mythic Cost: {2}{B}{B}{B} Lifelink

Overlord of the Boilerbilges (Japan Showcase) (Japanese) [Duskmourn: House of Horror] Magic Player Rewards 2006 An underground paradiseSet: Duskmourn: House of Horror Type: Enchantment Creature Avatar Horror Rarity: Mythic Cost: {4}{R}{R} Impending 4{2}{R}{R} (If you cast this spell for its impending cost, it enters with four time counters and isn't a creature until the last is removed. At the beginning of your end step, remove a time counter from it.) Whenever "Overlord of the Boilerbilges" enters or attacks, it deals 4 damage to any target.