Endless Foot Assault (TMC-008) - Commander: Teenage Mutant Ninja Turtles

Squad 1W (As an additional cost to cast this spell, you may pay 1W 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.