Cheapest priced copy (Jumpstart 2022): $0.79 at Card Kingdom, near mint, their price list as of .
Iridescent Hornbeetle 
Creature — Insect · 3/4 · Uncommon · Zendikar Rising · #187
At the beginning of your end step, create a 1/1 green Insect creature token for each +1/+1 counter you've put on creatures under your control this turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.79 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Jumpstart 2022 | 678 | Uncommon | $0.79 | — |
| Zendikar Rising | 187 | Uncommon | $0.79 | $0.99 |
3 rulings from Wizards of the Coast
- 25 September 2020If Iridescent Hornbeetle leaves the battlefield before your end step, its ability won’t trigger at all. You won’t create any tokens.
- 25 September 2020If a creature enters the battlefield under your control with +1/+1 counters on it, Iridescent Hornbeetle’s ability counts those counters.
- 25 September 2020Iridescent Hornbeetle’s ability counts the number of +1/+1 counters you’ve put on your creatures, even if that happened before Iridescent Hornbeetle was on the battlefield, and even if those creatures are no longer on the battlefield or under your control (and, in some rare cases, even if those creatures aren’t creatures anymore).