For the first one, a good example is MGs deck supporting relic barriers and howling mines as a card drawing engine and a semi-prison side strategy
Yes, youll have to pay some life too, but players start with 40 life in EDH and some commanders, like Oloro, Ageless Ascetic, give you a bunch of extra life to offset the cost
With how much card advantage it offers you, once you try Necropotence , youll never go back
You could always enchant it with Elemental Mastery and tap to make a ridiculously wide board
This is the precon decks second commander card, which can be used as an alternative to Caesar, Legions Emperor, but it is also one of the cards with less synergy with the rest of the build , as its dice-focused mechanic isn't too heavily invested in