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The setup here requires all permanents in play with Freed from the Real attached to Lightning-Rig Crew, which is not summoning sick
The other card I found that worked well as a supplement was Ephara's Enlightenment, a card that gives a +1/+1 counter when it attaches to a creature, then when the angel appears, the card returns to your hand (optionally), allowing you to cast it again to put another counter on the Geist
Urzas Cave Busted in Commander, Urza's Cave seems tempting in some kind of The Enigma Jewel deck, which is barely fringe in Standard, much less Modern
With 12 cards per pack, that means you will end up with a bounty of 288 cards
Notable Cards: Reprints and $$ This deck rewards you for killing or sacrificing creatures every turn with the morbid mechanic