Bloodthirsty Adversary
Haste When this creature enters, you may pay {2}{R} any number of times. When you pay this cost one or more times, put that many +1/+1 counters on this creature, then exile up to that many target instant and/or sorcery cards with mana value 3 or less from your graveyard and copy them. You may cast any number of the copies without paying their mana costs.
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Official rulings (3) · Scryfall
Whether or not you cast the copies this way, the original cards will remain in exile.
Copies cast this way are cast during the resolution of the ability. You don't have to follow normal timing requirements and you can't wait and cast them later.
After you pay the {2}{R} cost one or more times, a second ability triggers and you choose the targets for it. Players may respond to the new ability at that point. As that ability resolves, Bloodthirsty Adversary gets its counters and the target cards are exiled.