Runastragos, the Mathmagician

When Runastragos enters the battlefield, place a counter on him.
{x}{u}: {x} Equals the number of counters on Runastragos. Counter target spell, place a counter
on Runastragos, this can not be countered.
{x}{u}{u}, Remove all counters from Runastragos, {x} Equals the number of counters removed this
way: Deal {x} damage to target creature or player.
This can not be countered.
Rune's power is equal to his tokens.