The Infinite silex

The infinite silex enters the battlefield tapped
When the infinite Silax enters the battlefield
untap all lands you control then exile each
creature card in your graveyard thats red or black
{t} Pay {x}{b/r}{b/r}{b/r}{b/r} you may cast X creatures with converted mana cost four or less exiled with the
infant silex without paying their mana cost