Lightning Surge

Lightning Surge deals 4 damage to any target. Threshold — If there are seven or more cards in your graveyard, instead Lightning Surge deals 6 damage to that permanent or player and the damage can't be prevented. Flashback {5}{R}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6o28r80btdpb1hrd16i43n.