Once during your turn, if Psyduck is on your bench, you can discard the bottom card of your deck to put Mistys Psyduck on the top of your deck
Every other starter deck has bigger characters that will run this deck over, even with its variety of Resist cards
Xanathar, Guild Kingpin Xanathar, Guild Kingpin can be a fantastic control commander
It's affected by anything that affects either type and unaffected by things that affect non-Cat or non-Warrior creatures
A huge, human-like mask on a big bison-like animal would be an unsettling enough visual even if without the serene blue eyes, the fact that it's a living corpse, or the fact that a complete bison-like animal head might not even fit under that mask
Turns out the answer was simpler than that