Ban Malduhr's Hidden Forge

This spell costs {x} less to cast, where {x} is the
amount of noncombat damage done this turn.
{t}: Add {r}{r}. Ban Malduhr's Hidden Forge
deals 2 damage to any target.
Whenever a creature or planeswalker you
control deals damage, Ban Malduhr's Hidden
Forge deals damage equal to the damage dealt
to any target.