Trust me, I don't know the cards that well and usually resort to some of the various search tools when looking for cards. I'd stopped in the
Time Spiral block and only now am dipping my toe again. I use scryfall.com/advanced when it comes to looking up card.
I certainly here you when it comes to budget (especially playing paper) although getting in at the listed prices sometime seems impossible.
I might say the deck is taking a step back as this should be an aggressive deck and cutting back too far on the cats hurts your offense even as you look at other things.
Collective Effort and
Inspiring Roar are so much better if they are hitting four or five creatures instead of one; liked the
Sacred Cat because it can essentially be "recast" if killed the first time.
White Sun's Zenith isn't a "4 of" in this deck as you probably don't want to cast it for X<2 and really want X>3 which may take a while to reach.
Silver Flame Ritual is strictly better than
Inspiring Roar as both give your team +1/+1 counters but the ritual also give you
vigilance for the turn allowing you to attack without tapping anything so you'll have the survivors to play defense with.
You might look for more spot removal. For white you might look at
Banishing Light,
Cast Out, or
Conclave Tribunal (each should be about a quarter or less) all of which are enchantments that come into play and then remove a permanent of your opponent until the enchantment leaves play.
Banishing Light is 3 mana,
Cast Out is four BUT can be done at instant speed due to
Flash and could be cycled for a different card for one, and
Conclave Tribunal is also 4 but the cost can be reduced by tapping your own creatures to help pay for it.
In many ways
Whitemane Lion is your individual creature protection as you
flash that in if one of your important cats would be destroyed to replace it and let you recast your saved cat later.
Based in part on your earlier revision and some of what I mentioned here you might try this:
4
Adorned Pouncer2
Cast Out4
Collective Effort2
Conclave Tribunal4
King of the Pride24
Plains4
Regal Caracal4
Sacred Cat4
Savannah Lions2
Silverflame Ritual2
White Sun's Zenith4
Whitemane Lion