Feed the Swarm
Sorcery
Oracle Text
Destroy target creature or enchantment an opponent controls. You lose life equal to that permanent's mana value.
Flavor Text
"if it is consciousness that weaves your wills together... then we shall set you apart once more."
Legalities
legal
17alchemybrawlcommanderduelfuturegladiatorhistoriclegacymodernoathbreakerpauperpaupercommanderpioneerstandardstandardbrawltimelessvintage
Not Legal
4Prices
Foil$6.17
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Rulings
The amount of life you lose is determined by the permanent's mana value as it last existed on the battlefield.
wotc · 2024-11-08
If a permanent on the battlefield has 
in its mana cost, X is 0 for the purpose of determining its mana value.
wotc · 2024-11-08
If the target permanent is an illegal target by the time Feed the Swarm tries to resolve, the spell doesn't resolve. You don't lose any life. If the target is legal but not destroyed (most likely because it has indestructible), you do lose life.
wotc · 2024-11-08