Josivak, Always Searching

{t}: Draw two cards, then discard a card.
If a card would be put into an opponent's graveyard from anywhere except from the top of that player's library, exile it instead.
You may cast cards exiled with Josivak, Always Searching.
Whenever an opponent casts a spell with converted mana cost greater than the greatest converted mana cost among permanents you control, you lose 3 life and discard a card.