This isnt about optimization or turbo-power, this is more about cutting out near-unplayables (Aerie Mystics is not a card I saw hit the table and do anything, ever)
That potentiality puts it in the C-tier, although I expect most decks that want this effect will stick with Bitter Reunion
Phyrexian Elesh Norn, Grand Cenobite Phyrexian Jin-Gitaxias, Core Augur Phyrexian Sheoldred, Whispering One Phyrexian Urabrask the Hidden Phyrexian Vorinclex, Voice of Hunger These are only card styles, and to use them, you have to own the actual cards
cards to cards in hand to temporarily increase their power
If you can hold off a 3/3 with a 0/4 wall while beating down for a bit with evasion dorks then all is well
What affects the value of Ancient Cellarspawn