Ymir, First Titanshifter

Indestructible
Damage dealt to Ymir, First Titanshifter is dealt
in the form of -1/-1 counters, and it cannot be
sacrificed or targeted by spells and abilities.
When Ymir, First Titanshifter leaves the
battlefield, you may return it to the battlefield at
the beginning of the next end step tapped. Then
transform it.