Ideally Dorat would have rules text along the lines of Brothers Yamazaki or Seven Dwarves, capping the number you can have at three
White has plenty of better ways to pump your creatures, even with +1/+1 counters such as Cathars' Crusade, Collective Effort, and in specific decks Archangel of Thune / Metallic Mimic works too
These are not to be confused with proxies, cards used as stand-ins for the real thing for the purpose of testing or to keep valuable cards out of decks and safe
The ready effect can be useful but the lore gain is minimal and you also have to consider you need a location in play and to have a character moved there for this to even have a target
Whenever this creature attacks, you may sacrifice another creature or artifact
However, Partner in particular works slightly different depending on the wording