The Wind Crystal is a great addition to a white lifegain deck
I'm not complaining, they all make for good entries in my trade binder, but when you're spending decent money on sealed product it's nice to have more variation
This means it can also be used to block your opponent from using a combo-piece they've tutor with vampiric tutor or enlightened tutor
These are the categories where the steady money actually sits: Modern singles in Choose Your Card format
If you do want to use this line in your deck because they can fit into any type deck, I wouldn't use more than one each, you could definitely use Buneary right away then when you attack you'll have to switch it out, on the bench then evolve Buneary into Lopunny, get three energy cards on it, use Sitdown Bounce a couple of times then return everything to your hand
With both commanders out you can turn your sacrifices into resources, helping to accelerate you in mana and putting you several turns ahead of your opponents