Xeno, Nullity Strike

({p/b} can be paid with 2 life or {b}. Same with {p/c} except it's {w} instead)
Flash.

When Xeno, Nullity Strike enters the battlefield
under your control, exile every permanent each
player controls. If you exiled 15 or more permanents
this way, deal 20 damage to target player, then that
player discards its hand.

This card can't block.