Flying

As long as there are five or more mana values among cards in your graveyard, Aven Heartstabber gets +2/+2 and has deathtouch.

When Aven Heartstabber dies, mill two cards, then draw a card.

Counter target spell unless its controller pays {1}.

Cycling {U} ({U}, Discard this card: Draw a card.)

Counter target spell unless its controller pays {1} for each card in your graveyard.

Cycling {2} ({2}, Discard this card: Draw a card.)

Enchant creature

Enchanted creature has flying.

Cycling {1}{U} ({1}{U}, Discard this card: Draw a card.)

When a creature with mana value 6 or greater enters the battlefield, you may return Dragon Wings from your graveyard to the battlefield attached to that creature.

As an additional cost to cast this spell, sacrifice a creature, discard a card, or pay 4 life.

When Dusk Mangler enters the battlefield, each opponent sacrifices a creature, discards a card, and loses 4 life.

Lifelink

When Gravebreaker Lamia enters the battlefield, search your library for a card, put it into your graveyard, then shuffle.

Spells you cast from your graveyard cost {1} less to cast.

Whenever you discard a card, you may pay {1}. If you do, amass 2. (Put two +1/+1 counters on an Army you control. If you don't control one, create a 0/0 black Zombie Army creature token first.)

{T}: Draw two cards, then discard three cards.

Counter target spell unless its controller pays {2}.

Cycling {2} ({2}, Discard this card: Draw a card.)

As Monastery Siege enters the battlefield, choose Khans or Dragons.

• Khans -- At the beginning of your draw step, draw an additional card, then discard a card.

• Dragons -- Spells your opponents cast that target you or a permanent you control cost {2} more to cast.

Counter target spell.

Cycling {2} ({2}, Discard this card: Draw a card.)

Create a token that's a copy of target creature you control.

Jump-start (You may cast this card from your graveyard by discarding a card in addition to paying its other costs. Then exile this card.)

Whenever Rakshasa Debaser attacks, put target creature card from defending player's graveyard onto the battlefield under your control.

Encore {6}{B}{B} ({6}{B}{B}, Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery.)

{1}, Discard a card: Create a 0/3 blue Crab creature token.

Delirium -- Crabs you control get +1/+1 as long as there are four or more card types among cards in your graveyard.

{T}, Discard a card: Create a Food token. (It's an artifact with "{2}, {T}, Sacrifice this artifact: You gain 3 life.")

{4}, {T}, Sacrifice The Underworld Cookbook: Return target creature card from your graveyard to your hand.

Return target creature card with mana value 3 or less from your graveyard to the battlefield.

Cycling {2} ({2}, Discard this card: Draw a card.)