Cheapest priced copy (Strixhaven: School of Mages Promos): $0.49 at Card Kingdom, near mint, their price list as of .
Retriever Phoenix 
Creature — Phoenix · 2/2 · Rare · Strixhaven: School of Mages · #113
Flying, haste
When this creature enters, if you cast it, learn. (You may reveal a Lesson card you own from outside the game and put it into your hand, or discard a card to draw a card.)
As long as this card is in your graveyard, if you would learn, you may instead return this card to the battlefield.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $0.49 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Strixhaven: School of Mages Promos | 113p | Rare | $0.49 | $0.49 |
| Strixhaven: School of Mages Promos | 113s | Rare | — | $0.99 |
| Strixhaven: School of Mages | 113 | Rare | $0.49 | $0.49 |
| Strixhaven: School of Mages | 313 | Rare | $0.49 | $0.49 |
6 rulings from Wizards of the Coast
- 16 April 2021If Retriever Phoenix somehow dies with its triggered ability on the stack, you may return it to the battlefield with that triggered ability.
- 16 April 2021Retriever Phoenix must be in your graveyard at the moment you're instructed to learn if you want to use the last ability to return it to the battlefield.
- 16 April 2021If instructed to learn, you may do nothing. Discarding a card and putting a Lesson card into your hand are both optional.
- 16 April 2021If a card is brought into the game from outside the game, it will stay in the game until it ends or until its owner leaves the game, whichever comes first.
- 16 April 2021If you bring a card into the game from outside the game in a Constructed tournament (or a Constructed game played under tournament conditions), you may select only a card from your sideboard. In casual Constructed games, the card comes from your collection.
- 16 April 2021If you bring a card into the game from outside the game in a Sealed Deck or Booster Draft event, you may select only a card that is in the card pool that you built your deck from.