Kelsier, Survivor of Death

Indestructible, deathtouch, double strike,
menace, intimidate, shroud
At the beginning of each end step, put a -1/-1
counter on Kelsier, Death's Survivor.
{u/b}{u/b}, Pay any amount of life: Deal damage equal
to half the amount of life paid in this way
rounded up to any target. If more than 10 life
was paid in this way, Kelsier gains "-1/-1 counters
can't be put on this creature."