These two together ensure that no one at your table can block any of your creatures, and they force board wipes or targeted removal, which you can then defend against with protection spells
Commander has a ton of powerful ways to generate a bunch of mana, and turning that mana into cards, life, and a Jellyfish Hydra Beast that flies and tramples is pretty much everything you want to be doing in the format
That means a Mulldrifter that goes unblocked draws you two cards for attacking
This seemingly innocent card provides you with a minimum of 3 extra cards in exile and gets you a horror on top, outperforming most green or white equivalent auras that attempt to buff your commanders power and toughness for the same mana cost
Theyre card disadvantage, at least on the first cast, but binning two spells for 1 mana is amazingly efficient, especially with graveyard-based strategies revolving around mechanics like dredge and cards like Arclight Phoenix
Four abilities on one card is rare for any planeswalker