For your own creatures, you can equip them with Amorphous Axe or Runed Stalactite. I don't know and couldn't find any green card that turns creatures into a choosen creature type, that is more blue's thing. Various cards give creatures a specific creature type (like Knight, Vampire, etc.) and you could use some otherwise niche blue cards that change text to let those cards say "Bear" instead. Mirror Entity is white but turns all your creatures into every creature type including "Bear".
Caller of the Claw would do this in a substitutional way if you didn't care about base power and toughness, and for any number of creatures, combined with Spawning Pit or Altar of Dementia.
Private Mod Note
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Rollback Post to RevisionRollBack
"Warning: Um, warning. This is going to be a game state violation. And a taking extra turns and drawing extra cards violation, pretty much, a whole bunch of violations. Look at me, I'm the DCI."
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I'd prefer green or colorless colors.
Former Rules Advisor
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(The Gamers: Dorkness Rising)
"Any sufficiently analyzed magic is indistinguishable from science."
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