Lost Spire Gateway

Lost Spire Gateway enters the battlefield tapped.
As it enters the battlefield and as a sorcery once
on each of your turns, you may pay {x} and exile a
creature under it with a converted mana cost of {x} or less.
Lost Spire Gateway does not untap during your
untap step.
{x}{t}, Create a token copy of a creature card underneath Lost Spire Gateway.
{b/r}{b/r}{c}, Untap Lost Spire Gateway.