Cheapest priced copy (Murders at Karlov Manor): $0.49 at Card Kingdom, near mint, their price list as of .
Lamplight Phoenix 
Creature — Phoenix · 3/3 · Rare · Murders at Karlov Manor Promos · #137p
Flying
When this creature dies, you may exile it and collect evidence 4. If you do, return this card to the battlefield tapped. (To collect evidence 4, exile cards with total mana value 4 or greater from your graveyard.)
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
4 printings · $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Murders at Karlov Manor | 137 | Rare | $0.49 | $0.49 |
| Murders at Karlov Manor | 406 | Rare | $0.49 | $0.49 |
| Murders at Karlov Manor Promos | 137p | Rare | $0.49 | $0.49 |
| Murders at Karlov Manor Promos | 137s | Rare | — | $0.49 |
3 rulings from Wizards of the Coast
- 2 February 2024Once 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 February 2024You can't exile Lamplight Phoenix from your graveyard to pay the collect evidence cost of its triggered ability.
- 2 February 2024If you can't exile enough cards to meet or exceed the required mana value, you can't choose to collect evidence at all.