Another theme coming in from the green and white side of the color identity is +1/+1 counters, often passively generated
Squall, SeeD Mercenary Squall here is a solid creature, with what is essentially an exalted trigger for double strike, and can resurrect small creatures if he gets through making him a potentially large source of damage and card advantage
Discuss the infinite combos and powerful interactions included in your deck, such as those involving infinite mana, card draw, and storm counts
These, like other Universes Beyond cards, are legal in Legacy, Vintage, and EDH only
Finally, its nice to have other ways to resurrect your minions, Karmic Guide does exactly that and has a power of two, making them perfect for this deck, and Reveillark is an excellent target with that because they can then return two target creature cards with power two or less when they leave the battlefield
Nyxbloom Ancient doesn't produce any mana itself