Soul Immolation 156 (Lorwyn Eclipsed)

As an additional cost to cast this spell, blight X. X can't be greater than the greatest toughness among creatures you control. (Put X -1/-1 counters on a creature you control.) Soul Immolation deals X damage to each opponent and each creature they control.

NM - $5.30
LP - $4.30
MP - $3.20
HP - $2.20
DMG - $2.20