Cheapest priced copy (Edge of Eternities): $0.35 at Card Kingdom, near mint, their price list as of .
Illvoi Operative 
Creature — Jellyfish Rogue · 2/1 · Common · Edge of Eternities · #61
Whenever you cast your second spell each turn, put a +1/+1 counter on this creature.
Legal inCommanderBrawlStandardPioneerModernLegacyVintagePauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Edge of Eternities | 61 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 25 July 2025Illvoi Operative’s ability will count any spells you’ve cast this turn, which may include Illvoi Operative itself. It doesn’t matter if the other spells resolved, didn’t resolve, were countered, or are still on the stack. If Illvoi Operative was the first spell you cast this turn, the next spell you cast this turn is your second spell. Similarly, if Illvoi Operative was the second spell you cast this turn, its ability won’t trigger and it won’t get a +1/+1 counter.
- 25 July 2025Illvoi Operative’s ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered or otherwise leaves the stack without resolving.