wotc
If a permanent on the battlefield has {X} in its mana cost, X is 0 for the purpose of determining its mana value.
MTG · Card
◇ Catalog #257
Feed the Swarm
tle·#257·common·foil
Illus. Kotakan
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in vault
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for trade
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wishlisted
Nov '25
6 mo ago
Value
$1.52$0 (-17.5%)
30 days high $0.63 · low $0.48
Volatility · high
USD$0.52EUR€0.40
NM$0.52
Where to buy / sell
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Played in EDH
EDHrec rank #89 · Format staple
Variants
Gameplay
Sorcery
Destroy target creature or enchantment an opponent controls. You lose life equal to that permanent's mana value.
Buzzard-wasps single-mindedly scour the Si Wong Desert in search of dead or dying prey.
Legalities
tlrlegal
duellegal
brawllegal
pennynot legal
PreDH
Rulings · 3
wotc
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
The amount of life you lose is determined by the permanent's mana value as it last existed on the battlefield.
Notes
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Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Kotakan
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.