If you have an engine for creating either tokens or mana, Marneus will draw your whole deck for you, putting your combo win into your hand
If there is a creature you want that is in an opponents graveyard, you have the means to get that creature
If you prefer using a deck with Sapphire cards (check out our guide to Lorcana Ink Types for more details), it seems like a no-brainer to include Mufasa right now
This in turn feeds back into the minigame, where your opponent might put their best card first to punish you (or entice you) into looking farther
Delina, Wild Mage Delina, Wild Mage is already infamous for its ability to go infinite with just a little help
This decision will also tie into your overall color selection a deck splashing red for more cheap creature tokens and burn will lean into Aristocrats-style Aggro