Endless Foot Assault is a rare Enchantment card from Teenage Mutant Ninja Turtles Eternal (TMC), collector number 8. Current market price: $1.97 (foil $20.00), TCGplayer market prices via Scryfall.
Squad {1}{W} (As an additional cost to cast this spell, you may pay {1}{W} any number of times. When this enchantment enters, create that many tokens that are copies of it.) Whenever you attack, for each opponent, create a 1/1 black Ninja creature token that's tapped and attacking that player.