Kreatur — Meervolk, Detektiv
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: Enttappe ein anderes Permanent deiner Wahl, das du kontrollierst.

, Beweissicherung 3: Tappe eine Kreatur deiner Wahl, die du nicht kontrollierst. (Um Beweissicherung 3 durchzuführen, schicke Karten mit Gesamt-Manabetrag 3 oder mehr aus deinem Friedhof ins Exil.)
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.