Land As Primal Beyond comes into play, you may reveal an Elemental card from your hand. If you don't, Primal Beyond comes into play tapped. {T}: Add {1} to your mana pool. {T}: Add one mana of any color to your mana pool. Spend this mana only to play Elemental spells or activated abilities of Elementals.
Illus. Mark Tedin
You can use the mana produced by Primal Beyond's last ability to pay an alternative cost (such as evoke) or additional cost incurred while playing an Elemental spell. It's not limited to just that spell's mana cost. [Morningtide FAQ 2008/01/15]
The mana can't be spent to play activated abilities of Elemental sources that aren't in play (such as the reinforce ability of an Elemental card in your hand). [Morningtide FAQ 2008/01/15]