Runeflare Trap is a uncommon Instant — Trap card from Zendikar (ZEN), collector number 146. Current market price: $0.25 (foil $3.81), TCGplayer market prices via Scryfall.
If an opponent drew three or more cards this turn, you may pay {R} rather than pay this spell's mana cost. Runeflare Trap deals damage to target player equal to the number of cards in that player's hand.