Gateway To Agartha

When Gateway To Agartha enters the battlefield,
you get{e}{e}{e}{e}{e}{e}{e}{e}{e}{e}(ten energy counters)
{t}. Add one mana of any color for each creature
you control.
{t}, pay {e}{e}. Swap a creature you control with
one on the battlefield. These creatures must have
the same converted mana costs to be swapped