Polymorph decks have an inherent weakness that if they draw their key creatures, they often cant cast them, and they no longer have their important targets in the deck for something like Creativity
If thats not your thing, here are some other options: Zareth San, the Trickster Varragoth, Bloodsky Sire Thieves' Guild Enforcer Whispering Madness Reconnaissance Mission Coastal Piracy Bident of Thassa Mask of Memory Cloak and Dagger Blighted Agent BATTLE YOUR FRIENDS
In the case of Keruga, the companion requirement is that your starting deck contains only cards with a mana value of three or greater and lands
Ive tried to make my store really, really deep into Pokmon so that its kind of just an awesome experience, Overton said
Master new mechanics Earthbending, Airbendending, Waterbending and Firebending to tell your version of the story and discover your Magic playstyle