Splicer's Skill is a uncommon Sorcery card from The List (PLST), collector number MH1-31. Current market price: $0.33, TCGplayer market prices via Scryfall.
Create a 3/3 colorless Phyrexian Golem artifact creature token. Splice onto instant or sorcery {3}{W} (As you cast an instant or sorcery spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)