Cheapest priced copy (Murders at Karlov Manor): $4.49 at Card Kingdom, near mint, their price list as of .
Proft's Eidetic Memory 
Legendary Enchantment · Rare · Murders at Karlov Manor · #396
When Proft's Eidetic Memory enters, draw a card.
You have no maximum hand size.
At the beginning of combat on your turn, if you've drawn more than one card this turn, put X +1/+1 counters on target creature you control, where X is the number of cards you've drawn this turn minus one.
Legal inCommanderBrawlPioneerModernLegacyVintage
Banned inStandard
Not legal inPauper
4 printings · $4.49 to $9.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Murders at Karlov Manor | 67 | Rare | $4.49 | $4.49 |
| Murders at Karlov Manor | 396 | Rare | $5.49 | $7.99 |
| Murders at Karlov Manor Promos | 67p | Rare | $4.49 | $4.99Out of stock |
| Murders at Karlov Manor Promos | 67s | Rare | — | $9.49 |
3 rulings from Wizards of the Coast
- 2 February 2024The value of X is determined only once, as Proft's Eidetic Memory's last ability resolves.
- 2 February 2024If you haven't drawn more than one card by the time a beginning of combat step begins on your turn, Proft's Eidetic Memory's last ability won't trigger at all.
- 2 February 2024Proft's Eidetic Memory's last ability looks at how many cards you've drawn this turn, even if it wasn't on the battlefield when you drew those cards.