Okeno The slumbering dragon

Haste trample indestructible
Okeno enters the battlefield with five slumber counters on him
At the beginning of your upkeep remove a
slumber counter
When the last slumber counter is removed
Okeno does 10 damage to each opponent
Okeno can’t attack or block as long as
he has a slumber counter on him
{t} Add {r}{r}{r}