Necropotence

Skip your untap step.

At the beginning of your upkeep, you may pay X life. If you do, untap X permanents.

Pay ½ life: Exile the top card of your library face down. Put that card into your hand at the beginning of the next end step.

Skip your draw step.

At the beginning of your end step, you may pay any amount of life. If you do, draw that many cards.

Your maximum hand size is five.

If a card or token would be put into your graveyard from anywhere, exile it instead.

When this creature is put into your graveyard from the battlefield, at the beginning of the next end step, you lose 1 life and return this card to your hand.

Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

At the beginning of your end step, draw a card for each age counter on this enchantment.

When this enchantment is put into a graveyard from the battlefield, you lose 2 life for each age counter on it.

At the beginning of your upkeep, exile a card from your graveyard.

Threshold — As long as there are seven or more cards in your graveyard, this enchantment has "Whenever a nontoken creature is put into your graveyard from the battlefield, you may pay . If you do, return that card to your hand."

At the beginning of your upkeep, exile the bottom creature card of your library. You may cast that card this turn. At the beginning of the next end step, if that card is still exiled, put it into your graveyard and create a Treasure token.