Dunost, Creator of the 3rd Age

Flying, Indestructible, Can block any number of creatures.
{t}: Put 2 radiant counters on Dunost.
You may choose not to untap Dunost.
If Dunost is tapped during your upkeep,
double the number of radiant counters on it.
{t}: remove all radiant counters from Dunost, deal
that amount of damage to all opponents, and creatures they control.