Helga Sinclair Tough as Nails makes for a good early-game play on turn 2, threating almost anything in a challenge
While there isnt an overabundance of cards that call out cats specifically, you can also supplement your deck with any generic typal support cards like Banner of Kinship
Change the target of target spell or ability with a single target
In terms of dealing damage to the opposing side, your best bet is currently summoning wizards and their copies with Inalla and then using cards like Impact Tremors and Purphoros, God of the Forge
This card gives you a nice incentive to play out your hand, not to mention that it adds an extra card to any wheel effect that discards your hand to draw a new one
For example, take While using hybrid mana in this way helped solve the design issue, we discovered that this type of mana cost caused a lot of confusion