With the Mists of Lorien, you have a chance to pick and choose which cards you want to get rid of, or all of them if you have enough mana
With The Treatment is Working ability, Baymax not only heals your characters, but gets you closer to a lore victory
The consistent life loss fuels commanders like Belbe, Corrupted Observer and Rakdos, Lord of Riots for almost no mana
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If you do, you can return a creature with power two or less from your graveyard to the battlefield, but now it is tapped and attacking
A normal Aura would 'fizzle' and go to the graveyard if its target is no longer present or valid when it resolves