At the beginning of your upkeep, if there are four or more creature cards in your graveyard, return a creature card at random from your graveyard to your hand.

Choose a Background (You can have a Background as a second commander.)

When this creature enters, if you have four or more creature cards in your graveyard, you may return target creature card from your graveyard to your hand.

Reach

At the beginning of your upkeep, mill two cards. (Put the top two cards of your library into your graveyard.)

, Exile this creature: Return target card from your graveyard to your hand.

At the beginning of your upkeep, if this card is the only creature card in your graveyard, you may return this card to the battlefield.

At the beginning of each player's upkeep, that player chooses target player whose graveyard has fewer creature cards in it than their graveyard does and is their opponent. The first player may return a creature card from their graveyard to their hand.

Amplify 1 (As this creature enters, put a +1/+1 counter on it for each Zombie card you reveal in your hand.)

At the beginning of your upkeep, if this card is in your graveyard, you may pay . If you do, return it to your hand.

Haste

At the beginning of your upkeep, if this card is in your graveyard with three or more creature cards above it, you may put this card onto the battlefield.

At the beginning of your upkeep, if this card is in your graveyard, you may pay . If you do, return it to your hand.

, Sacrifice this creature: It deals 2 damage to any target.

, Discard a creature card: Return target creature card from your graveyard to your hand.

, Pay 2 life: Return target creature card from your graveyard to your hand.

At the beginning of your upkeep, if there are three or more creature cards in your graveyard, put a +1/+1 counter on this creature.

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."

, , Discard a card: Return target creature card from your graveyard to your hand.

Indestructible

: Add .

, , Exile a creature you control: Harness The Soul Stone. (Once harnessed, its ∞ ability is active.)

∞ — At the beginning of your upkeep, return target creature card from your graveyard to the battlefield.

, Sacrifice a creature: Return target creature card from your graveyard to your hand.

, Sacrifice this enchantment: Return up to three target creature cards from your graveyard to your hand.

At the beginning of your upkeep, you may exile a creature card from a graveyard. If you do, put a +1/+1 counter on this creature. If you don't, tap this creature.

At the beginning of your upkeep, target opponent may exile a card from their graveyard. If that player doesn't, you may draw a card.