Cheapest priced copy (Jumpstart 2022): $4.49 at Card Kingdom, near mint, their price list as of .
Elvish Warmaster 
Creature — Elf Warrior · 2/2 · Rare · Kaldheim · #363
Whenever one or more other Elves you control enter, create a 1/1 green Elf Warrior creature token. This ability triggers only once each turn.
{5}{G}{G}: Elves you control get +2/+2 and gain deathtouch until end of turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
6 printings · $4.49 to $12.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Jumpstart 2022 | 654 | Rare | $4.49 | — |
| Kaldheim | 167 | Rare | $4.49 | $5.99 |
| Kaldheim | 363 | Rare | $6.49 | $8.99 |
| Tales of Middle-earth Commander | 241 | Rare | $4.49 | — |
| Kaldheim Promos | 167p | Rare | $4.49 | $12.99 |
| Kaldheim Promos | 167s | Rare | — | $9.99 |
3 rulings from Wizards of the Coast
- 5 February 2021It doesn't matter how many Elves enter the battlefield under your control. The ability creates only one Elf Warrior creature token.
- 5 February 2021Once the triggered ability has triggered once during a turn, it can't trigger again, even if the triggered ability is still on the stack, has been countered, or has otherwise left the stack.
- 5 February 2021The activated ability affects only Elves you control as the ability resolves. Elves you begin to control later in the turn won't get the bonuses. Creatures you control that become Elves later in the turn won't get the bonuses, and Elves you control that got the bonuses that stop being Elves later in the turn won't lose them.