Cheapest priced copy (Born of the Gods): $0.35 at Card Kingdom, near mint, their price list as of .
Fearsome Temper 
Enchantment — Aura · Common · Born of the Gods · #95
Enchant creature
Enchanted creature gets +2/+2 and has "{2}{R}: Target creature can't block this creature this turn."
Legal inCommanderPioneerModernLegacyVintagePauper
Not legal inBrawlStandard
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Born of the Gods | 95 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 1 February 2014The target creature can still block other attacking creatures.
- 1 February 2014The activated ability granted by Fearsome Temper can’t change or undo a block that’s already happened. For it to have an effect, you must activate it no later than the declare attackers step.