In a world where cards entering the battlefield matters more though, flicker or blink effects, which make a card leave the battlefield momentarily only for it to enter the battlefield again, become much better
Then, we knew we had to make it even more exciting so we could stuff it with fancy foils and rares and/or mythic rares
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
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
Many of these creatures have flying, unblockable, etc