Vigra, The Fallen

: Whenever a spell or ability an opponent controls targets you or a permanent you control, that spells controller must pay {2} or mill 2 cards.
-3: Target player mills 5 cards; You may cast a card that was put into an opponents graveyard from anywhere this turn, without paying its mana cost.
X: Mill X cards; Gain 1 life for each Robot put into your graveyard this way.