Zyx, Immortal Entity

{x}{w}{t}: you gain X life
{x}{x}{u}{t}: Draw X cards
{x}{b}{t}: Return X cards from your graveyard: put those cards on top of your library in any order
{x}{x}{r}{t}: Deal X damage to target creature or player
{x}{g}{t}: Create X 0/1 plant creature tokens
{x}{x}{x}{c}{t}: Destroy X target permanents
{0}: Regenerate Zyx, Immortal Entity
Zyx, Immortal Entity cannot be exiled