Eanna, House of Heavens

{t}: add{c}{c} to your mana pool
Tap target creatures you control, {t}: add x mana of any colour to your mana pool where x is the the total converted mana cost of the creatures you tapped.
Go close to the Eanna Temple, the residence of Ishtar,
such as no later king or man ever equaled!
~The Epic of Gilgamesh, tablet 1