2 Feb 2024
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.
2 Feb 2024
Surveillance Monitor's last ability triggers whenever you collect evidence for any reason, not just when you collect evidence with its first ability.
2 Feb 2024
If you can't exile enough cards to meet or exceed the required mana value, you can't choose to collect evidence at all.