Hundred-Talon Strike is a common Instant — Arcane card from Betrayers of Kamigawa (BOK), collector number 8. Current market price: $0.21 (foil $0.60), TCGplayer market prices via Scryfall.
Target creature gets +1/+0 and gains first strike until end of turn. Splice onto Arcane—Tap an untapped white creature you control. (As you cast an Arcane 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.)