Cheapest priced copy (Forgotten Realms Commander): $0.99 at Card Kingdom, near mint, their price list as of .
Sun Titan 
Creature — Giant · 6/6 · Mythic · Magic 2012 · #39
Vigilance
Whenever this creature enters or attacks, you may return target permanent card with mana value 3 or less from your graveyard to the battlefield.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
27 printings · $0.99 to $17.99 at Card Kingdom
4 rulings from Wizards of the Coast
- 15 August 2010The mana value of a card in your graveyard is determined solely by the mana symbols printed in its upper right corner. The mana value is the total amount of mana in that cost, regardless of color. For example, a card with mana cost {3}{U}{U} has mana value 5.
- 15 August 2010A permanent card is an artifact, creature, enchantment, land, or planeswalker card.
- 15 August 2010If a card in your graveyard has no mana symbols in its upper right corner (because it's a land card, for example), its mana value is 0.
- 15 August 2010If the mana cost of a card in your graveyard includes {X}, X is considered to be 0.