Cheapest priced copy (Modern Horizons 2): $0.35 at Card Kingdom, near mint, their price list as of .
Guardian Kirin 
Creature — Kirin · 2/3 · Common · Modern Horizons 2 · #15
Flying
Whenever another creature you control dies, put a +1/+1 counter on this creature.
Legal inCommanderModernLegacyVintagePauper
Not legal inBrawlStandardPioneer
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons 2 | 15 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 18 June 2021If Guardian Kirin and another creature you control die simultaneously (perhaps because they were both attacking or blocking), Guardian Kirin won't be on the battlefield as its triggered ability resolves. It can't be saved by the +1/+1 counter that would have been put on it.