Cheapest priced copy (Double Masters 2022): $0.35 at Card Kingdom, near mint, their price list as of .
Centaur Battlemaster 
Creature — Centaur Warrior · 3/3 · Uncommon · Theros · #154
Heroic — Whenever you cast a spell that targets this creature, put three +1/+1 counters on this creature.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Double Masters 2022 | 140 | Uncommon | $0.35 | $0.49 |
| Theros | 154 | Uncommon | $0.35 | $0.49 |
3 rulings from Wizards of the Coast
- 15 September 2013Heroic abilities won't trigger when a copy of a spell is created on the stack or when a spell's targets are changed to include a creature with a heroic ability.
- 15 September 2013Heroic abilities will trigger only once per spell, even if that spell targets the creature with the heroic ability multiple times.
- 15 September 2013Heroic abilities will resolve before the spell that caused them to trigger.