Fireball [Summer Magic / Edgar] Dominaria Prerelease Promos each opponent sacrifices a permanent

each opponent sacrifices a permanent unless they pay {1}

Set: Mercadian Masques Type: Sorcery Rarity: Common Cost: {1}{B} Target player discards a card at random

At the beginning of enchanted player's upkeep

Set: Commander 2014 Type: Creature — Sphinx Rarity: Rare Cost: {5}{U}{U} Flying

but it is sometimes also a matter of opportunity

Fireball [Summer Magic / Edgar] Dominaria Prerelease Promos each opponent sacrifices a permanentSet: Summer Magic Edgar 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.