Wren's Run Vanquisher is a uncommon Creature — Elf Warrior card from Jumpstart (JMP), collector number 447. Current market price: $0.21, TCGplayer market prices via Scryfall.
As an additional cost to cast this spell, reveal an Elf card from your hand or pay {3}. Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)