Cheapest priced copy (Innistrad: Double Feature): $0.69 at Card Kingdom, near mint, their price list as of .
Rotten Reunion 
Instant · Common · Innistrad: Midnight Hunt · #119
Exile up to one target card from a graveyard. Create a 2/2 black Zombie creature token with decayed. (It can't block. When it attacks, sacrifice it at end of combat.)
Flashback {1}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
2 printings · $0.69 to $6.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Innistrad: Double Feature | 119 | Common | $0.69 | $6.99 |
| Innistrad: Midnight Hunt | 119 | Common | $0.79 | $0.99 |
5 rulings from Wizards of the Coast
- 24 September 2021Decayed does not create any attacking requirements. You may choose not to attack with a creature that has decayed.
- 24 September 2021You don't have to choose any targets for Rotten Reunion. However, if you do, and that target is illegal as Rotten Reunion tries to resolve (perhaps because your opponent responded with their own Rotten Reunion), it will be removed from the stack and you won't create a Zombie token.
- 24 September 2021Decayed represents a static ability and a triggered ability. "Decayed" means "This creature can't block" and "When this creature attacks, sacrifice it at end of combat."
- 24 September 2021Once a creature with decayed attacks, it will be sacrificed at end of combat, even if it no longer has decayed at that time.
- 24 September 2021Decayed does not grant haste. Creatures with decayed that enter the battlefield during your turn may not attack until your next turn.