The energy mechanic was introduced in Kaladesh, and it has returned a few times since, with a notable surge of energy cards in Modern Horizons 3
Check the Not Collected checkbox to ensure that cards you dont have (and may want to craft using your wildcards) will appear and then select OK. 4
In terms of MTG's color pie, black is the color that benefits from discard the most, and its usually the color that makes people discard the most too
Once you've completed Tomb of Annihilation, Acererak's attack trigger becomes difficult for opponents to deal with
Dont underestimate this card in Commander or any Limited format
Liliana, the Last Hope #93 Eldritch Moon Change Version Liliana, the Last Hope Legendary Planeswalker Liliana +1: Up to one target creature gets -2/-1 until your next turn