Overlord of the Balemurk gives a black graveyard deck both setup and recovery in one entry. It mills four cards, then can return a non-Avatar creature or a planeswalker from your graveyard to your hand. The card you recover can be one of the cards just milled, making the trigger useful even when the graveyard began nearly empty.
Impending offers that first trigger for two mana. The Overlord enters with five time counters and is not a creature until the last is removed, with one coming off at each of your end steps. You get the milling and recovery immediately, then wait for the attacking body unless another effect changes the situation.
Casting it normally for five mana gives you a creature without the impending delay. Later attacks repeat the same mill-and-return effect, helping maintain a hand of useful creatures or planeswalkers. Blink effects can also generate fresh entries, while the enchantment type offers another angle for decks that care about enchantments entering or remaining on the battlefield. The non-Avatar restriction prevents the creature-return option from simply picking up any Avatar in the graveyard. Keep the actual creature types in mind when planning recursion packages. The Overlord is most useful when the milled cards have value beyond the one returned to hand, such as reanimation targets or flashback spells. That turns each trigger into broader setup rather than merely a search through four cards for something to recast.
