Balakki, Battlefield Mentor

At the beginning of the game, if Balakki, Battleground Mentor is your commander, choose Warrior and up to one other creature type.
Whenever a creature of one or more of the chosen types enters the battlefield under your control, you may pay {2}{r}. If you do, create a token that's a copy of it. It gains haste. At end of turn, sacrifice it.
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