You choose which nonland permanent Clever Impersonator will copy, if any, as it enters the battlefield
The other notable one is Hostile Hostel, which can transform into Creeping Inn, a 3/7 horror construct that exiles a creature card from a graveyard when it attacks, before each opponent loses X life and you gain X life, with X being the number of creatures it has exiled
Bringing back a 1-drop is an easy enough feat, though Grist will still flip to its planeswalker side if you already control it and bring back something else instead
As the deck slowly evolved, Primal Amulet has become a utility piece that does not always want to be flipped
Theres also the survivor creatures from Duskmourn : theyre meant to trigger when they survive combat, but its way easier to just saddle or station with them before our second main phase
With it not effecting the board and the ability to scry for various amounts make it easy to tag on to things in a balanced manner and not make them too powerful