Kaleidoscorch

Sorcery - (uncommon)

Converge — Kaleidoscorch deals X damage to any target, where X is the number of colors of mana spent to cast this spell.
Flashback  (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Price

cardmarket 0.02

tcgplayer 0.04

cardsphere 0.13

cardkingdom 0.49