Cheapest priced copy (Innistrad: Midnight Hunt): $2.99 at Card Kingdom, near mint, their price list as of .
Jadar, Ghoulcaller of Nephalia 
Legendary Creature — Human Wizard · 1/1 · Rare · Secrets of Strixhaven Commander · #217
At the beginning of your end step, if you control no creatures with decayed, create a 2/2 black Zombie creature token with decayed. (It can't block. When it attacks, sacrifice it at end of combat.)
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
6 printings · $2.99 to $19.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Innistrad: Double Feature | 108 | Rare | $5.49 | $19.99 |
| Innistrad: Midnight Hunt | 108 | Rare | $2.99 | $4.99 |
| Innistrad: Midnight Hunt | 315 | Rare | $3.99 | $9.99 |
| Innistrad: Midnight Hunt Promos | 108p | Rare | $3.49 | $5.99 |
| Innistrad: Midnight Hunt Promos | 108s | Rare | — | $16.99 |
| Secrets of Strixhaven Commander | 217 | Rare | $3.49 | — |
4 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 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 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 2021Decayed does not grant haste. Creatures with decayed that enter the battlefield during your turn may not attack until your next turn.