Reach
Whenever Six attacks, mill three cards. You may put a land card from among them into your hand.
During your turn, nonland permanent cards in your graveyard have retrace. (You may cast permanent cards from your graveyard by discarding a land card in addition to paying their other costs.)

Hua Tuo, Honored Physician

{T}: Put target creature card from your graveyard on top of your library. Activate only during your turn, before attackers are declared.

Jarad, Golgari Lich Lord

Jarad, Golgari Lich Lord gets +1/+1 for each creature card in your graveyard.
{1}{B}{G}, Sacrifice another creature: Each opponent loses life equal to the sacrificed creature's power.
Sacrifice a Swamp and a Forest: Return Jarad from your graveyard to your hand.

Brawn

Trample
As long as Brawn is in your graveyard and you control a Forest, creatures you control have trample.

Anger

Haste
As long as Anger is in your graveyard and you control a Mountain, creatures you control have haste.

Eternal Witness

When Eternal Witness enters, you may return target card from your graveyard to your hand.

Kiki-Jiki, Mirror Breaker

Haste
{T}: Create a token that's a copy of target nonlegendary creature you control, except it has haste. Sacrifice it at the beginning of the next end step.

Adun Oakenshield

{B}{R}{G}, {T}: Return target creature card from your graveyard to your hand.

Hermit Druid

{G}, {T}: Reveal cards from the top of your library until you reveal a basic land card. Put that card into your hand and all other cards revealed this way into your graveyard.

Buried Alive

Search your library for up to three creature cards, put them into your graveyard, then shuffle.

Zealous Conscripts

Haste
When Zealous Conscripts enters, gain control of target permanent until end of turn. Untap that permanent. It gains haste until end of turn.

Lord of Extinction

Lord of Extinction's power and toughness are each equal to the number of cards in all graveyards.