If damage would be dealt to you, exile that many cards from your graveyard instead. If you can't, you lose the game.
If you would gain life, draw that many cards instead.
When this enchantment leaves the battlefield, you lose the game.

Whenever a creature attacks, flip a coin. If you win the flip, the next time that creature would deal combat damage this turn, it deals double that damage instead. If you lose the flip, the next time that creature would deal combat damage this turn, prevent that damage.

Flying
Your maximum hand size is reduced by four.

, : Reveal the top card of your library. If it's a creature card, put it onto the battlefield. Otherwise, put it into your graveyard.

Threshold — This creature gets +7/+7 as long as there are seven or more cards in your graveyard.

Mortivore's power and toughness are each equal to the number of creature cards in all graveyards.
: Regenerate this creature. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

This creature enters with three +1/+1 counters on it.
At the beginning of your upkeep, sacrifice this creature unless you remove a +1/+1 counter from it.
, Discard a card: Put a +1/+1 counter on this creature.

Target player sacrifices a land of their choice.
Threshold — Each player sacrifices all lands they control instead if there are seven or more cards in your graveyard.

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 an Atog creature: Atogatog gets +X/+X until end of turn, where X is the sacrificed creature's power.

Target player mills half their library, rounded down.

Trample
This creature enters with seven +1/+1 counters on it.
Whenever you tap a land for mana, remove a +1/+1 counter from this creature.

At the beginning of your upkeep, if you have 200 or more cards in your library, you win the game.

Whenever you cast an instant or sorcery spell, you may pay . If you do, copy that spell. You may choose new targets for the copy.

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.

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

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.

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 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.

, 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.

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

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."

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

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.

Choose any number of creatures target player controls. Choose the same number of creatures another target player controls. Those players exchange control of those creatures. (This effect lasts indefinitely.)

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.

Return all permanents to their owners' hands.

You gain 2 life for each card in your graveyard.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Flying
, Discard a card: Return this creature to its owner's hand.

Whenever this creature deals combat damage to a creature, destroy that creature at end of combat.
Threshold — As long as there are seven or more cards in your graveyard, all creatures able to block this creature do so.

Flying, protection from each color

Flying
Whenever a creature dealt damage by this creature this turn dies, put a +1/+1 counter on this creature.
: This creature deals 1 damage to target creature.

Flying
Cognivore's power and toughness are each equal to the number of instant cards in all graveyards.

: This creature deals 1 damage to each creature without flying.