Searing Barb is a common Sorcery card from March of the Machine (MOM), collector number 163. Current market price: $0.17 (foil $0.11), TCGplayer market prices via Scryfall.
Searing Barb deals 2 damage to any target. If it's a creature, it can't block this turn. Incubate 1. (Create an Incubator token with a +1/+1 counter on it and "{2}: Transform this token." It transforms into a 0/0 Phyrexian artifact creature.)