Onslaught, Nightmare Entity

If a source you control would deal noncombat damage to an opponent or a permanent an opponent controls, it deals double that damage
to that player or permanent instead.
{p/r}{p/r}, Discard two cards: Put an indestructible counter on Onslaught,
Nightmare Entity. ({p/r} can be paid with
either {r} or 2 life.)