Cheapest priced copy (Ravnica: Clue Edition): $0.35 at Card Kingdom, near mint, their price list as of .
Challenger Troll 
Creature — Troll · 6/5 · Uncommon · War of the Spark · #157
Each creature you control with power 4 or greater can't be blocked by more than one creature.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $0.35 to $0.79 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ravnica: Clue Edition | 159 | Uncommon | $0.35 | — |
| Foundations Commander | 194 | Uncommon | $0.35 | — |
| Jumpstart 2022 | 639 | Uncommon | $0.35 | — |
| The List | WAR-157 | Uncommon | $0.35 | — |
| War of the Spark | 157 | Uncommon | $0.35 | $0.79 |
3 rulings from Wizards of the Coast
- 3 May 2019If a creature you control with power 4 or greater has menace, it can’t be blocked by only one creature and it can’t be blocked by more than one creature, so it simply can’t be blocked.
- 3 May 2019Once a creature you control with power 3 or less has become blocked by two or more creatures, changing its power won’t cause either blocking creature to stop blocking it.
- 3 May 2019Challenger Troll’s ability affects itself as long as its power remains 4 or greater.