Savage Ghoul, it can eat the dead to regain 2 HP. A strategy to use with this card would be to keep feeding it corpses with Sacrificial Altar or just sacrificing units in general. It's a pretty standard unit, but its regeneration ability and strong stats make it a staple in any deck and a cut above the rest.
Strong against: Just about any weak ally without any good tricks.
Weak against: graveyard-emptying decks (Ghoul Lord can't heal if the graveyard is empty) and filler decks with many cards in play at once.