Keyword: Threshold

: Untap target land.
Threshold — : Untap up to three target lands. Activate this ability only if seven or more cards are in your graveyard.

First strike
Threshold — As long as seven or more cards are in your graveyard, Possessed Barbarian gets +1/+1, is black, and has “, : Destroy target red creature.”

Discard a card: Putrid Imp gains flying until end of turn.
Threshold — As long as seven or more cards are in your graveyard, Putrid Imp gets +1/+1 and can’t block.

Threshold — As long as seven or more cards are in your graveyard, Mystic Zealot gets +1/+1 and has flying.

Protection from black
Threshold — As long as seven or more cards are in your graveyard, Mystic Enforcer gets +3/+3 and has flying.

: Prevent the next 2 damage that would be dealt to any target this turn.
Threshold — : Prevent the next 4 damage that would be dealt to any target this turn. Activate this ability only if seven or more cards are in your graveyard.

Flying, vigilance
Threshold — As long as seven or more cards are in your graveyard, Wayward Angel gets +3/+3, is black, has trample, and has “At the beginning of your upkeep, sacrifice a creature.”

Vigilance
Threshold — As long as seven or more cards are in your graveyard, Mystic Penitent gets +1/+1 and has flying.

: Add .
Threshold — Werebear gets +3/+3 as long as seven or more cards are in your graveyard.

Threshold — Krosan Beast gets +7/+7 as long as seven or more cards are in your graveyard.

: Infected Vermin deals 1 damage to each creature and each player.
Threshold — : Infected Vermin deals 3 damage to each creature and each player. Activate this ability only if seven or more cards are in your graveyard.

Flying
Threshold — As long as seven or more cards are in your graveyard, Childhood Horror gets +2/+2 and can’t block.

, Discard a card: Regenerate Dirty Wererat.
Threshold — As long as seven or more cards are in your graveyard, Dirty Wererat gets +2/+2 and can’t block.

Shower of Coals deals 2 damage to each of up to three targets.
Threshold — Shower of Coals deals 4 damage to each of those permanents and/or players instead if seven or more cards are in your graveyard.

Thermal Blast deals 3 damage to target creature.
Threshold — Thermal Blast deals 5 damage instead if seven or more cards are in your graveyard.

Enchant creature
Enchanted creature gets +2/+2.
Threshold — As long as seven or more cards are in your graveyard, all creatures able to block enchanted creature do so.

: Add . Cabal Pit deals 1 damage to you.
Threshold — , , Sacrifice Cabal Pit: Target creature gets -2/-2 until end of turn. Activate this ability only if seven or more cards are in your graveyard.

Protection from black and from red
Threshold — As long as seven or more cards are in your graveyard, Mystic Crusader gets +1/+1 and has flying.

: Add . Nomad Stadium deals 1 damage to you.
Threshold — , , Sacrifice Nomad Stadium: You gain 4 life. Activate this ability only if seven or more cards are in your graveyard.

Shroud (This creature can’t be the target of spells or abilities.)
Threshold — Nimble Mongoose gets +2/+2 as long as seven or more cards are in your graveyard.

Enchant creature
Enchanted creature has flying.
Threshold — Enchanted creature has shroud as long as seven or more cards are in your graveyard. (It can’t be the target of spells or abilities.)

Flying
Whenever a creature dealt damage by Repentant Vampire this turn dies, put a +1/+1 counter on Repentant Vampire.
Threshold — As long as seven or more cards are in your graveyard, Repentant Vampire is white and has “: Destroy target black creature.”

: Add . Cephalid Coliseum deals 1 damage to you.
Threshold — , , Sacrifice Cephalid Coliseum: Target player draws three cards, then discards three cards. Activate this ability only if seven or more cards are in your graveyard.

Threshold — Springing Tiger gets +2/+2 as long as seven or more cards are in your graveyard.

At the beginning of your upkeep, exile a card from your graveyard.
Threshold — As long as seven or more cards are in your graveyard, Decaying Soil 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.”