Cheapest priced copy (Reality Fracture Commander): $1.29 at Card Kingdom, near mint, their price list as of .
Serra's Emissary 
Creature — Angel · 7/7 · Mythic · Reality Fracture Commander · #32
Flying
As this creature enters, choose a card type.
You and creatures you control have protection from the chosen card type.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
4 printings · $1.29 to $29.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Reality Fracture Commander | 32 | Mythic | $1.29 | — |
| Modern Horizons 2 | 30 | Mythic | $5.99 | $22.99 |
| Modern Horizons 2 | 333 | Mythic | $8.49 | $19.99Out of stock |
| Modern Horizons 2 Promos | 30s | Mythic | — | $29.99 |
2 rulings from Wizards of the Coast
- 18 June 2021You may choose any card type. The ones that may appear in a normal game of Magic are artifact, battle, creature, enchantment, instant, kindred, land, planeswalker, and sorcery. Supertypes such as snow and basic may not be chosen. Subtypes such as Angel, Aura, and Forest also may not be chosen.
- 18 June 2021The card type choice is a replacement effect, not a triggered ability. It doesn't use the stack and can't be responded to. Notably, if you choose instant, your opponent can't try to cast an instant on the Emissary before it has protection.