Will of the Mardu is a rare Instant card from Tarkir: Dragonstorm Commander (TDC), collector number 57. Current market price: $5.46, TCGplayer market prices via Scryfall.
Choose one. If you control a commander as you cast this spell, you may choose both instead. • Create a number of 1/1 red Warrior creature tokens equal to the number of creatures target player controls. • Will of the Mardu deals damage to target creature equal to the number of creatures you control.