Reinforcement

In additional to cast Reinforcement, discard a
card.
Create 4 red Forgotten creature token 2/1 with
"Haste".
Burn Up {2}{r}{r} (When you discard this card, you
may cast it from your graveyard for its Burn Up cost
until end of turn. If you do, instead it deals 4 damage to
any target then exile it.)