Bag of Holding
{1}
Artifact
Whenever you discard a card, exile that card from your graveyard.
{2}, {T}: Draw a card, then discard a card.
{4}, {T}, Sacrifice ~this~: Return all cards exiled with ~this~ to their owner's hand.
Necropotence
{B}{B}{B}
Enchantment
Skip your draw step.
Whenever you discard a card, exile that card from your graveyard.
Pay 1 life: Exile the top card of your library face down. Put that card into your hand at the beginning of your next end step.