Creature — Merfolk Detective
1/3
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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.
: Untap another target permanent you control., Collect evidence 3: Tap target creature you don't control. (To collect evidence 3, exile cards with total mana value 3 or greater from your graveyard.)