Into the Fray is a common Instant — Arcane card from Saviors of Kamigawa (SOK), collector number 106. Current market price: $0.25 (foil $0.54), TCGplayer market prices via Scryfall.
Target creature attacks this turn if able. Splice onto Arcane {R} (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.)