If you really want to commit to the Sirens Call and Angels Trumpet idea, you can springboard off the Mandate of Peace idea and just play Peacekeeper and other cards that prevent creatures from attacking
I think Burn is a very real deck with Magic Foundations , mainly due to Boros Charm, but for another Red card: Boltwave
Green Goblin on his glider doesnt get in the way of Doc Ocks tentacles, and Venom can be lurking anywhere for a chance to strike they all have their own space in the scene to shine
In fact, any modal double-faced permanent that is instructed to transform now can, although only the new ones in this set come with built-in ways to make that happen
However, two commanders that caught my eye might bear consideration: Ertai, the CorruptedErtai, the Corrupted needs a creature or an enchantment to sacrifice in order to counter a spell
It actually felt like it had depth and power in the way a goblin deck does