Liliana's Elite

This creature gets +1/+1 for each creature card in your graveyard.

Burning Inquiry

Each player draws three cards, then discards three cards at random.

Writhing Necromass

This spell costs {1} less to cast for each creature card in your graveyard.
Deathtouch

Recommission

Return target artifact or creature card with mana value 3 or less from your graveyard to the battlefield. If a creature enters this way, it enters with an additional +1/+1 counter on it.

Exhume

Each player puts a creature card from their graveyard onto the battlefield.

Tethmos High Priest

Heroic — Whenever you cast a spell that targets this creature, return target creature card with mana value 2 or less from your graveyard to the battlefield.

Myr Servitor

At the beginning of your upkeep, if Myr Servitor is on the battlefield, each player returns all cards named Myr Servitor from their graveyard to the battlefield.

Unearth

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.)

Songs of the Damned

Add {B} for each creature card in your graveyard.

Faithless Looting

Draw two cards, then discard two cards.
Flashback {2}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)