Folletta Acchiappacriminali

If you can't exile enough cards to meet or exceed the required mana value, you can't choose to collect evidence at all.

Once you've announced that you're casting a spell, players can't take actions until you've finished doing so. Notably, opponents can't try to remove cards from your graveyard to stop you from collecting evidence.

You may target a creature that is already tapped with Crimestopper Sprite's last ability. If the target creature is already tapped as the ability resolves and evidence was collected, you will still put a stun counter on it.