Fiend Artisan
{B/G}{B/G}
Creature -- Nightmare
1/1
~this~ gets +1/+1 for each creature card in your graveyard.
{X}{b/g}, {T}, Sacrifice another creature: Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle. Activate only as a sorcery.
Jarad, Golgari Lich Lord
{B}{B}{G}{G}
Legendary Creature -- Zombie Elf
2/2
~this~ gets +1/+1 for each creature card in your graveyard.
{1}{B}{G}, Sacrifice another creature: Each opponent loses life equal to the sacrificed creature's power.
Sacrifice a Swamp and a Forest: Return ~this~ from your graveyard to your hand.