It pairs nicely with token generators and with death payoffs like Mirkwood Bats, Pitiless Plunderer, and Zulaport Cutthroat, and its forestwalk ability has synergies with Toski, The Odd Acorn Gang, and other creatures that care about dealing combat damage to a player
Players are also including Serra Paragon in Commander and Modern decks, as prices are steady for the Mythic Rare angel
You could always Rite of Replication on Nyxbloom Ancient to see how much mana you can make in a single game
Pair that up with haste and its one of the most brutal ways to end a game in a single turn
Emmara won't give you more tokens to work with, but she will keep them alive a little longer to do your dirty work
Unravel the Aether and Deglamer have seen a ton of sideboard play over the years for how efficiently and effectively they answer problematic enchantments