Jeskiir, Thrice Slain

Jeskiir, Thrice Slain enters the battlefield with
3 bone counters on it.
Jeskiir, Thrice Slain's power and toughness
are equal to the amount of bone counters on it
If Jeskiir would die or be put into exile,
instead remove a bone counter from it, if you
can't, exile Jeskiir.