Don't Try This at Home is a rare Enchantment card from Unfinity (UNF), collector number 391. Current market price: — (foil $0.22), TCGplayer market prices via Scryfall.
If a hot source you control would deal damage to a permanent or player, it deals that much damage plus 1 instead. (Something is hot if it has hot things in its art, like fire or explosions.) {1}{R}, Sacrifice this enchantment: It deals damage equal to twice the number of hot cards in your graveyard to target creature or planeswalker.