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Still, if you have seeded your graveyard with creatures you can cast, once this lands, you can turn your graveyard into your hand, at least for creatures

Transforming Gwen Stacy doesn't cause her to leave the battlefield, which means that the card you exiled when she entered can still be played after she transforms

Blacks Devoid entry is a creature that gets in pretty easily and lets you pay life to cast an opponents spell, not from the top of their library, but by cascading down to it

Flash is what pushes it over the top for me

This ability also looks at tokens, so if you have a way to reliably make Angel tokens you can keep getting them larger and larger

While Talion may not prove to be as good as having a Rhystic Study in the command zone, you can definitely draw a lot of cards if you choose the correct number