Are the cards not available to be bought as well? It's always good to rent first, good thinking!

With your daily splinterlands blogs you make a nice amount of HBD, I think it's good to get some extra archons so you have more options. I'm playing with an alt account last days, Bella is really awesome as well because she counters both Tofu and Nidhogr and can be used in rulesets like Briar Patch, Spell Reflect and Return Fire - basically cancelling these rulesets.

Keep in mind for a legendary archon like Frankie, you need only 1 copy to be able to summon Bronze level cards (lvl 3 common, 2 rare, 2 epic and 1 legendary) but you will need 5 rare copies of archons like Bella and Kaylia.