Barharashazar, symbol of hope

Creatures you control have lifelink.
{x}{t}, Barharashazar, symbol of hope deals X damage to target creature.
Cycling {2}
At the very center of his pupil; there was a tiny gold
speck, dancing in each one.
The feeling in his eyes was that he would aid you,
but if you proved yourself unworthy
of his aid, he would kill you in an instant.