Creature - Human Knight (1/2)
2(W/U)(W/U): regenerate any number of target creatures with power 1 or less
Discard a card, T: ~this~ deals 6 damage to target attacking or blocking creature with total power and toughness X or less, where X is the number of libraries an opponent controls. If a creature damaged this way would be put into a graveyard this turn, exile it instead

Creature - Dragon (1/1)
At the beginning of your upkeep, ~this~ deals 1 damage to target creature for each card in your graveyard
Whenever ~this~ is put into a graveyard from the battlefield, destroy target artifact

Hellbent - If you have no cards in hand, When ~this~ enters the battlefield, destroy target creature
When ~this~ enters the battlefield, up to four target red creatures get -1/-4 until end of turn