Drae'yllia, Throne of Aethin

Each time Drae'yllia, Throne of Aethin becomes untapped, add a charge counter to it.
Drae'yllia, Throne of Aethin does not untap
during your untap step.
{p/b}{p/b}{t}, target creature gains a -0/-1 counter.
{p/u}{p/u}{t}, target creature gains a +1/+0 counter.
{p/b}{p/u}, untap Drae'yllia, Throne of Aethin.
{t}{u/b}{u/b}{u/b}{u/b}{u/b}, remove {x} charge counters, exile
target permanent with total converted mana cost {x}, this cannot be 0.