Ouroboros Lizard

Burrow - {0} (Exile this creature and create a 0/1 colorless Sand creature token. Return this creature to the battlefield under its owner's control at the beginning of the next end step.)
You may choose not to return Ouroboros Lizard from exile at the end step.
At the beginning of each upkeep, if Ouroboros Lizard is in exile, create a 0/1 colorless Sand creature token.