If you thought just giving your creatures flying was good, this gives all your creatures flying, +2/+2, and firebreathing
That may not sound huge, but my guess is that it will be, adding even more reasons to play Tera Pokemon
You'll want to get the Treasures at instant speed if possible, otherwise it's an immediate 3-on-1 situation before your alternate wincon pops
Overall, the deck looks like it will be really fun to play with casually , but it's a little one-dimensional, and it wouldn't take much for your plans to fall apart, especially if your opponents target your graveyard
Honorable Mentions Sliver Hive is basically an auto-include in a sliver deck, no sliver in the type line though, otherwise, it'd be near the best-ranked card here