Surveillance Monitor
Creature — Vedalken Detective
When this creature enters, you may collect evidence 4. (Exile cards with total mana value 4 or greater from your graveyard.)
Whenever you collect evidence, create a 1/1 colorless Thopter artifact creature token with flying.
Thopters don't take breaks, and neither does he.
Scott Murphy
Rulings
If you can't exile enough cards to meet or exceed the required mana value, you can't choose to collect evidence at all.
(wotc • 2024-02-02)
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.
(wotc • 2024-02-02)
Surveillance Monitor's last ability triggers whenever you collect evidence for any reason, not just when you collect evidence with its first ability.
(wotc • 2024-02-02)
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Rulings
If you can't exile enough cards to meet or exceed the required mana value, you can't choose to collect evidence at all.
(wotc • 2024-02-02)
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.
(wotc • 2024-02-02)
Surveillance Monitor's last ability triggers whenever you collect evidence for any reason, not just when you collect evidence with its first ability.
(wotc • 2024-02-02)