Dreamborn Muse Cards that mill the whole EDH table are reasonably rare, so the fragile Dreamborn Muse and its constant mill every upkeep has its place
Why each of these
Beza, the Bounding Spring Bria, Riptide Rogue Byrke, Long Ear of the Law Dragonhawk, Fate's Tempest Eluge, the Shoreless Sea Glarb, Calamity's Augur Helga, Skittish Seer Hugs, Grisly Guardian Kitsa, Otterball Elite Lumra, Bellow of the Woods Maha, Its Feathers Night Ral, Crackling Wit Rottenmouth Viper Season of Gathering Season of Loss Season of Weaving Season of the Bold Season of the Burrow Stormsplitter The Infamous Cruelclaw Warren Warleader Ygra, Eater of All
Players will keep the creatures that are most useful to steal off the battlefield until Deadpool's no longer a threat, and can - with a bit of effort - easily shut you down before your copying shenanigans get too silly