Cheapest priced copy (Ultimate Masters): $0.79 at Card Kingdom, near mint, their price list as of .
Hero of Iroas 
Creature — Human Soldier · 2/2 · Rare · Born of the Gods · #17
Aura spells you cast cost {1} less to cast.
Heroic — Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.79 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Born of the Gods | 17 | Rare | $0.99 | $1.49 |
| Ultimate Masters | 20 | Uncommon | $0.79 | $0.99 |
6 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 resolve before the spell that caused them to trigger.
- 15 September 2013Heroic abilities will trigger only once per spell, even if that spell targets the creature with the heroic ability multiple times.
- 1 February 2014Hero of Iroas's first ability will apply if you cast a card for its bestow cost.
- 7 December 2018To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions. The mana value of the spell remains unchanged, no matter what the total cost to cast it was.
- 7 December 2018Hero of Iroas's first ability reduces only generic mana in the spell's total cost.