Fireball [International Collectors' Edition] 81 Xorns are native to the

Xorns are native to the Elemental Plane of Earth

and furthermore

Exile target creature

Set: Fallout Type: Creature — Lhurgoyf Rarity: Mythic Cost: {1}{G} Scrounging Deathclaw's power is equal to the number of card types among cards in all graveyards and its toughness is equal to that number plus 1

−8: You get an emblem with “Whenever a creature dies

Fireball [International Collectors' Edition] 81 Xorns are native to theSet: International Collectors' Edition Type: Sorcery Rarity: Common Cost: {X}{R} This spell costs {1} more to cast for each target beyond the first. Fireball deals X damage divided evenly, rounded down, among any number of targets.