Realmbreaker and Arcane Adaptation on the battlefield.
"Praetor" chosen with Arcane Adaptation.
({10} magic symbol) available.
Steps
Activate Realmbreaker's second ability by paying ({10} magic symbol) , tapping and sacrificing it, causing you to search for all creatures in your library, as they are all Praetors due to Arcane Adaptation, and put them onto the battlefield.
Results
Put all creature cards from your library onto the battlefield.