Helen, Duchess of Selhoff

Protection from white and black.
Whenever you convey a card, Helen, Duchess of Selhoff, deals damage to any target equal to the conveyed card's converted mana cost.
(A conveyed card can be cast by any player, using
mana as though it were mana of any colour to cast it.)
{t}, convey a nonland card: draw a card for each
card in your graveyard of the same type and colour
as the conveyed card.