Cheapest priced copy (Urza's Saga): $0.35 at Card Kingdom, near mint, their price list as of .
Disruptive Student 
Creature — Human Wizard · 1/1 · Common · Battle Royale Box Set · #21
{T}: Counter target spell unless its controller pays {1}.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
2 printings · $0.35 to $0.39 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Battle Royale Box Set | 21 | Common | $0.39 | — |
| Urza's Saga | 69 | Common | $0.35 | — |