Cheapest priced copy (Tarkir: Dragonstorm Promos): $0.59 at Card Kingdom, near mint, their price list as of .
Avenger of the Fallen 
Creature — Human Warrior · 2/4 · Rare · Tarkir: Dragonstorm · #337
Deathtouch
Mobilize X, where X is the number of creature cards in your graveyard. (Whenever this creature attacks, create X tapped and attacking 1/1 red Warrior creature tokens. Sacrifice them at the beginning of the next end step.)
Legal inCommanderBrawlStandardPioneerModernLegacyVintage
Not legal inPauper
4 printings · $0.59 to $1.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tarkir: Dragonstorm Promos | 73p | Rare | $0.59 | $0.99 |
| Tarkir: Dragonstorm Promos | 73s | Rare | — | $1.79 |
| Tarkir: Dragonstorm | 73 | Rare | $0.79 | $0.79 |
| Tarkir: Dragonstorm | 337 | Rare | $0.59 | $1.49 |
3 rulings from Wizards of the Coast
- 4 April 2025The value of X is calculated only once, as Avenger of the Fallen’s mobilize ability resolves.
- 4 April 2025You choose the player, planeswalker, or battle each Warrior token is attacking. They don’t all have to attack the same one, and they don’t have to attack the same player, planeswalker, or battle as the creature with mobilize.
- 4 April 2025Although the Warrior tokens enter as attacking creatures, they were never declared as attacking creatures. Abilities that trigger whenever a creature attacks won’t trigger when the tokens enter attacking.