Kronos, Titan of Time

Indestructible
Kronos, Titan of Time enters the battlefield
with X +1/+1 counters on it.
Whenever a creature leaves the battlefield add
a +1/+1 counter to Kronos, Titan of Time.
Remove Eight +1/+1 counters: Target player
takes an extra turn after this one.
"Time stops for no man, nor god, only for the end..."