Liesa was known throughout Innistrad for bargaining with the demons that threatened humanity, and that is represented in you being able to pay life instead of her Commander tax
Minthara, Merciless Soul is a 2/2 for four that accumulates experience counters after your turn goes by with a permanent leaving the battlefield
Here, we have another tie
Allows you to protect and bounce perhaps a Cyclonic Rift of your own, let's you get a free Harrow while your opponent pays for its cost, or navigate your way through a stack war with style
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Then youd play Recurring Nightmare, sacrifice a creature immediately to swap it with the big nasty creature card in your graveyard, and then swing with it for game