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Giada counts itself, so even if Giada is the only Angel on the battlefield, the next Angel entering will get a +1/+1 counter on it
Despite the fact that the first options commanders (Carth and Guff) have the word planeswalker written on them multiple times, I dont think I would actually choose them (for the record, I would build Guff as the control the board, slow tick-up and Carth as the counter shenanigans deck)
Reach a power of 7 or higher on your creatures to break past your limit
Dipping into alternate art and variants can dramatically increase the price of the cards as well, so keep that in mind while pricing your deck out
Use Facebook, Reddit, and auction sites like Heritage Auctions or eBay auctions