Cheapest priced copy (Journey into Nyx): $0.35 at Card Kingdom, near mint, their price list as of .
Colossal Heroics 
Instant · Uncommon · Journey into Nyx · #118
Strive — This spell costs {1}{G} more to cast for each target beyond the first.
Any number of target creatures each get +2/+2 until end of turn. Untap those creatures.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Journey into Nyx | 118 | Uncommon | $0.35 | $0.49 |
9 rulings from Wizards of the Coast
- 26 April 2014Colossal Heroics can target any creatures, not just ones that are tapped.
- 26 April 2014The mana cost and mana value of strive spells don't change no matter how many targets they have. Strive abilities affect only what you pay.
- 26 April 2014If all of the spell's targets are illegal when the spell tries to resolve, it won't resolve and none of its effects will happen. If one or more of its targets are legal when it tries to resolve, the spell will resolve and affect only those legal targets. It will have no effect on any illegal targets.
- 26 April 2014Heroic abilities will resolve before the spell that caused them to trigger.
- 26 April 2014Heroic abilities will trigger only once per spell, even if that spell targets the creature with the heroic ability multiple times.
- 26 April 2014If such a spell is copied, and the effect that copies the spell allows a player to choose new targets for the copy, the number of targets can't be changed. The player may change any number of the targets, including all of them or none of them. If, for one of the targets, the player can't choose a new legal target, then it remains unchanged (even if the current target is illegal).
- 26 April 2014You choose how many targets each spell with a strive ability has and what those targets are as you cast it. It's legal to cast such a spell with no targets, although this is rarely a good idea. You can't choose the same target more than once for a single strive spell.
- 26 April 2014Heroic 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.
- 26 April 2014If a spell or ability allows you to cast a strive spell without paying its mana cost, you must pay the additional costs for any targets beyond the first.