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.

Enchant creature
Enchanted creature gets +1/+0.
Sacrifice Crackling Club: It deals 1 damage to target creature.

Enchant green or white creature
Enchanted creature has "At the beginning of your upkeep, sacrifice this creature unless you discard a card."

: Basking Rootwalla gets +2/+2 until end of turn. Activate only once each turn.
Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Whenever Carrion Rats attacks or blocks, any player may exile a card from their graveyard. If a player does, Carrion Rats assigns no combat damage this turn.

As an additional cost to cast this spell, discard X cards.
Return X target creature cards from your graveyard to your hand.

, Sacrifice Enslaved Dwarf: Target black creature gets +1/+0 and gains first strike until end of turn.

Prevent all damage a source of your choice would deal this turn.

As an additional cost to cast this spell, discard a card at random.
Sonic Seizure deals 3 damage to any target.

Draw a card.
Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

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

When Mesmeric Fiend enters, target opponent reveals their hand and you choose a nonland card from it. Exile that card.
When Mesmeric Fiend leaves the battlefield, return the exiled card to its owner's hand.

Discard a card: Switch Aquamoeba's power and toughness until end of turn.

Flying
Threshold — As long as seven or more cards are in your graveyard, Mystic Familiar gets +1/+1 and has protection from black.

Sacrifice Cephalid Snitch: Target creature loses protection from black until end of turn.

When you control no Swamps, sacrifice Barbarian Outcast.

Enchant creature
Enchanted creature gets +1/+1 and has flying.
Discard a card: Return enchanted creature to its owner's hand.

Green creatures and white creatures can't block this turn.
Flashback—, Pay 3 life. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Target creature gains haste until end of turn.
Draw a card.

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

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.

Counter target spell with mana value 3 or less. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.

Target player discards a card.
Draw a card.

When Longhorn Firebeast enters, any opponent may have it deal 5 damage to them. If a player does, sacrifice Longhorn Firebeast.

Enchant creature
Enchanted creature has ": This creature gets +1/+1 until end of turn."
When enchanted creature dies, return that card to the battlefield under your control.

When Gravegouger enters, exile up to two target cards from a single graveyard.
When Gravegouger leaves the battlefield, return the exiled cards to their owner's graveyard.

Fiery Temper deals 3 damage to any target.
Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Destroy target enchantment.
Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

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

Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.
Threshold — If seven or more cards are in your graveyard, instead search your library for up to three basic land cards, put them onto the battlefield tapped, then shuffle.

, Exile three cards from your graveyard: Target player loses 3 life.

, Sacrifice Hydromorph Guardian: Counter target spell that targets a creature you control.

Target creature gets -2/-2 until end of turn.
Flashback—, Pay 3 life. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Vigilance
: Prevent the next 1 damage that would be dealt to any target this turn.

Enchant creature
As Floating Shield enters, choose a color.
Enchanted creature has protection from the chosen color. This effect doesn't remove Floating Shield.
Sacrifice Floating Shield: Target creature gains protection from the chosen color until end of turn.

Flying
Discard a card: Return Skywing Aven to its owner's hand.