Gamble

Search your library for a card, put that card into your hand, discard a card at random, then shuffle your library.

Planar Void

Whenever another card is put into a graveyard from anywhere, exile that card.

Bereavement

Whenever a green creature dies, its controller discards a card.

Arc Lightning

Arc Lightning deals 3 damage divided as you choose among one, two, or three targets.