2024-02-02
If you can't exile enough cards to meet or exceed the required mana value, you can't choose to collect evidence at all.
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.
2024-02-02
You can't exile Lamplight Phoenix from your graveyard to pay the collect evidence cost of its triggered ability.