Putrid Imp

Discard a card: This creature gains lifelink until end of turn.

Threshold — This creature gets +1/+2 as long as there are seven or more cards in your graveyard.

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)

Threshold — As long as there are seven or more cards in your graveyard, this creature gets +2/+2 and can't block.

Flying

At the beginning of your upkeep, mill a card.

Threshold — As long as there are seven or more cards in your graveyard, this creature gets +1/+1 and has "At the beginning of your end step, exile two cards from your graveyard."

Flying

Threshold — As long as there are seven or more cards in your graveyard, this creature gets +2/+2 and has "When this creature becomes the target of a spell or ability, sacrifice it."

: This creature gets +3/+0 and gains flying until end of turn.

Discard a card: This creature gains flying until end of turn.