Ramp You can build ramp decks in various ways, like relying on mana rocks or ramp spells
I think they're fantastic and have a lot of useful utility
Up to X target creatures gain fear until end of turn
It's not a card you want to play on turn 3, but come turn 5-6, it has the ability to be a game changer, whether you're flashing back an important early game spell, or using the Harmonize ability to cast an expensive spell at a reduced rate
Illusionist's Gambit can absolutely save you while ending the night for someone else, but this is the poster child for a 4-drop that will rot in your hand while you wait for a better time to cast it
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