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

Sacrifice a creature: Target player discards two cards. Activate only as a sorcery.

Whenever a creature dies, that creature's controller sacrifices a land of their choice.

Flying (This creature can't be blocked except by creatures with flying or reach.)
: Target player reveals the top card of their library.

Discard a card at random: This creature gains first strike and haste until end of turn.

Exile all cards from target player's graveyard other than basic land cards. For each card exiled this way, search that player's library for all cards with the same name as that card and exile them. Then that player shuffles.

Exile target attacking creature.
Draw a card.

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 there are seven or more cards in your graveyard.

Whenever a green nontoken creature dies, that creature's controller may search their library for a card with the same name as that creature, put it onto the battlefield, then shuffle.

, Exile two cards from your graveyard and this creature: Destroy target nonblack creature. It can't be regenerated.

Create a 4/4 green Beast creature token.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Enchant creature (Target a creature as you cast this. This card enters attached to that creature.)
You control enchanted creature.

Flying
Whenever this creature becomes the target of a spell or ability, sacrifice it unless you discard a land card.

, Discard a card at random: This creature gets +3/+0 until end of turn.

, Exile a card from your graveyard: This enchantment deals 1 damage to each creature and each player.

Creatures you control get +3/+3 and gain trample until end of turn. (Each of those creatures can deal excess combat damage to the player or planeswalker it's attacking.)

Target player draws cards equal to the number of cards in their hand, then discards that many cards.

Counter target spell.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Threshold — This creature gets +4/+4 as long as there are seven or more cards in your graveyard.

Whenever this creature becomes blocked, it gets +2/+2 until end of turn for each creature blocking it.

Flying
Discard a card: This creature gets +4/+4 until end of turn. Activate only once each turn.

Enchant creature
At the beginning of each upkeep, put a plague counter on this Aura.
Enchanted creature gets -1/-1 for each plague counter on this Aura.
When enchanted creature leaves the battlefield, that creature's controller returns this Aura from its owner's graveyard to the battlefield.

Enchant land
Enchanted land has ": Target player loses 3 life."

Morbid Hunger deals 3 damage to any target. You gain 3 life.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Flying
, Discard a card: This creature gets +2/+2 until end of turn.

, Discard a card: This creature gains fear until end of turn. (It can't be blocked except by artifact creatures and/or black creatures.)

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

Return all permanents to their owners' hands.

, Sacrifice this creature: Target player draws a card.

Destroy all creatures. They can't be regenerated.
Threshold — If there are seven or more cards in your graveyard, instead destroy all creatures, then create two 1/1 white Spirit creature tokens with flying. Creatures destroyed this way can't be regenerated.

Tap an untapped Octopus you control: Tap target permanent.
: Tap all creatures without flying.

As an additional cost to cast this spell, choose a number between 0 and 5.
Liquid Fire deals X damage to target creature and 5 minus X damage to that creature's controller, where X is the chosen number.

, Sacrifice a creature: Target creature gets -2/-2 until end of turn.
, Exile a creature card from your graveyard: Target creature gets -2/-2 until end of turn.

, Discard a card: This creature gains trample until end of turn.
Threshold — As long as there are seven or more cards in your graveyard, this creature gets +2/+2 and has shroud. (It can't be the target of spells or abilities.)

Haste (This creature can attack and as soon as it comes under your control.)
: Kamahl deals 3 damage to any target.

At the beginning of your upkeep, you may create a 1/1 green Squirrel creature token.
Threshold — All Squirrels get +2/+2 as long as there are seven or more cards in your graveyard.