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Text:

Rulings:

• 9/25/2020 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.
• 9/25/2020 The amount of life you lose is determined by the permanent’s converted mana cost as it last existed on the battlefield.
• 9/25/2020 If a permanent on the battlefield has <img src="/Handlers/Image.ashx?size=small&amp;name=X&amp;type=symbol" alt="Variable Colorless" align="absbottom" /> in its mana cost, X is considered to be 0.