play them, eat your opponents, repeat
Misty commanding a mischievous Psyduck, Ethan unleashing Typhlosions fury, a sleek Lapras with its trainer, devious Meowth scheming alongside Rocket grunts, elegant Roserade in floral glory, fiery Blaziken mid-battle, protective Kangaskhan with its joey, and swift Rapidash charging ahead
You can also stop opponents from targeting cards in their own graveyards while benefiting from cards with escape or scavenge
Anything you want to accomplish with Rionya can be attempted with Delina, Wild Mage too, but its much harder to pull off, given she makes a tapped and attacking creature, and given that creature will be exiled at the end of combat which will happen as you move to the next combat phase
Allosaurus Shepherd can be used outside of Elf decks, sure but its still not as universal as youd think
Then, draw cards equal to the number you returned to your deck