I built around them both with stuff like Hei Bei, Joo Dee and Buzzard-Wasp Colony too, and then the one mentioned above too
You can find additional information on Salt and Synergy and Synergy in EDHREC's Frequently Asked Questions
Rise of the Floodborn is set 2, Into the Inklands is set 3, Ursulas Return is set 4 and, as we now know, Shimmering Skies is the fifth set
Commander Aphelia, Viper Whisperer Deathtouch Whenever Aphelia attacks, you may pay
Sunbird Standard / Sunbird Effigy Tell me you're a sunburst card without having sunburst as a keyword
Most mono decks are simple to play due to not having to worry about what mana sources you have available