One match does not a good deck make. Doesn't mean it's a bad deck, but a single matchup doesn't mean it's BDIF, and even then, that's an ever-changing discussion of its own right.
As for budget, Shrine isn't exactly cheap last I heard. It's going for $6 right now on the low end, so even playing 3 still costs you $18.
As stated, we'd need to know the OP's budget to give deck suggestions in full.
Pricing out individual cards, you can do with the help of tcgplayer and other such sites.
Also, note that many decks right now do NOT run 4 Cynthia. Though buying Mach Strike theme decks twice would net you 4 Cynthia in the process, along with a handful of other possible cards.
The next step I'd take would be to look at Limitless TCG's decklists and find one you like, price it off of a site like TCGplayer, then take said list to your local game shop and see if they have any deals/any cards available from said list that fall within your budget. If not, then look at buying online.
As for playtesting a deck, your local game shop will be your best bet unless you happen to be in contact with a high number of local players already.
If I must give a suggestion, I'd say Metagross GX is good to start with. It's bulky, hits like a tank, and isn't very expensive to build unless you're trying to bling things out or play a ton of Steven's resolves in it, which isn't necessary.
Either way, best of luck, OP.