Keyword: Threshold

Threshold — As long as seven or more cards are in your graveyard, Hunting Grounds has “Whenever an opponent casts a spell, you may put a creature card from your hand onto the battlefield.”

Create two 2/2 green Bear creature tokens.
Threshold — Create four 2/2 green Bear creature tokens instead if seven or more cards are in your graveyard.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Flying
Threshold — As long as seven or more cards are in your graveyard, Battlewise Aven gets +1/+1 and has first strike.

Threshold — Swirling Sandstorm deals 5 damage to each creature without flying if seven or more cards are in your graveyard.

Green creatures and white creatures have protection from Gorgons.
Threshold — Masked Gorgon has protection from green and from white as long as seven or more cards are in your graveyard.

: Add .
Threshold — : Nantuko Monastery becomes a 4/4 green and white Insect Monk creature with first strike until end of turn. It’s still a land. Activate this ability only if seven or more cards are in your graveyard.

Creatures you control get +0/+2 until end of turn.
Threshold — If seven or more cards are in your graveyard, choose a color. Creatures you control also gain protection from the chosen color until end of turn.

Destroy all enchantments.
Threshold — If seven or more cards are in your graveyard, instead destroy all enchantments, then return all cards in your graveyard destroyed this way to the battlefield.

Add .
Threshold — Add instead if seven or more cards are in your graveyard.

Protection from black
Threshold — Nantuko Blightcutter gets +1/+1 for each black permanent your opponents control as long as seven or more cards are in your graveyard.

Threshold — As long as seven or more cards are in your graveyard, Cephalid Sage has “When Cephalid Sage enters the battlefield, draw three cards, then discard two cards.”

Reach (This creature can block creatures with flying.)
Threshold — Seton’s Scout gets +2/+2 as long as seven or more cards are in your graveyard.

Vigilance
Threshold — As long as seven or more cards are in your graveyard, Reborn Hero has “When Reborn Hero dies, you may pay . If you do, return Reborn Hero to the battlefield under your control.”

Flash
Threshold — As long as seven or more cards are in your graveyard, Teroh’s Vanguard has “When Teroh’s Vanguard enters the battlefield, creatures you control gain protection from black until end of turn.”

: 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.

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

Destroy target land.
Threshold — If seven or more cards are in your graveyard, instead destroy that land and Rancid Earth deals 1 damage to each creature and each player.

Kamahl’s Sledge deals 4 damage to target creature.
Threshold — If seven or more cards are in your graveyard, instead Kamahl’s Sledge deals 4 damage to that creature and 4 damage to that creature’s controller.

Haste
Threshold — As long as seven or more cards are in your graveyard, Centaur Chieftain has “When Centaur Chieftain enters the battlefield, creatures you control get +1/+1 and gain trample until end of turn.”

Flying
Threshold — As long as seven or more cards are in your graveyard, Gloomdrifter has “When Gloomdrifter enters the battlefield, nonblack creatures get -2/-2 until end of turn.”

Threshold — As long as seven or more cards are in your graveyard, Pardic Arsonist has “When Pardic Arsonist enters the battlefield, it deals 3 damage to any target.”

, : Target creature gets -1/-1 until end of turn.
Threshold — , : Target creature gets -2/-2 until end of turn. Activate this ability only if seven or more cards are in your graveyard.

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