Fireball [International Collectors' Edition] Squid Set: Rise of the Eldrazi

Set: Rise of the Eldrazi Type: Creature — Eldrazi Rarity: Common Cost: {9} You may sacrifice four Eldrazi Spawn rather than pay this spell's mana cost

then repeats this process until a creature card or X cards have been put into their graveyard this way

Set: Eldritch Moon Prerelease Promos Type: Legendary Creature — Eldrazi Rarity: Mythic Cost: {13} This spell costs {1} less to cast for each card type among cards in your graveyard

whenever either of those creatures deals combat damage

(To play Seven Questions

Fireball [International Collectors' Edition] Squid Set: Rise of the EldraziSet: 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.