Cryptex
, Collect evidence 3: Add one mana of any color. Put an unlock counter on this artifact. (To collect evidence 3, exile cards with total mana value 3 or greater from your graveyard.)
Sacrifice this artifact: Surveil 3, then draw three cards. Activate only if this artifact has five or more unlock counters on it.
Illustrated by Yeong-Hao Han
This printing
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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.
Cryptex's first ability is a mana ability. It doesn't use the stack and can't be responded to.
If you can't exile enough cards to meet or exceed the required mana value, you can't choose to collect evidence at all.
