Bloodcurdler

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

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."

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

Threshold — As long as there are seven or more cards in your graveyard, this creature gets +1/+1 and can't block.

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.

Threshold — As long as there are seven or more cards in your graveyard, this creature gets +2/+2 and has "When this creature dies, you lose 4 life."

At the beginning of your upkeep, exile a card from your graveyard.

Threshold — As long as there are seven or more cards in your graveyard, this enchantment has "Whenever a nontoken creature is put into your graveyard from the battlefield, you may pay . If you do, return that card to your hand."