I dont like the life loss on either though there really isnt enough room to be losing life every turn, and there arent enough aggro decks that want Ancient Tomb and can finish a game fast enough to not be punished by it
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Parker Luck is Keen Duelist, except you can pick two opponents to ensure they both lose life, if you get to the end game with life totals already low
Badass monster on your side with a ton of abilities and the added benefit of taking something down if it gets killed
Legendary Artifact Yggdrasil, Rebirth Engine When Yggdrasil enters, exile all creature cards from your graveyard
Most notably, whenever you cast a creature spell, you create a 1/1 Human token with training