Endless Onslaught

Create three red 1/1 Warrior creature tokens with haste.
Reverberate 3 - {4}{r}{r} (Rather than cast this card from your hand, pay {4}{r}{r} and exile it
with three wave counters on it. At the beginning
of your upkeep, remove a wave counter from it.
If you do, you may cast a copy of this card without paying its mana cost.)