Prosper, from the accompanying Commander decks, is an interesting case, because it is the first time they tried to find synergies for the mechanic
Honorable Mentions Nicanzil, Current ConductorNicanzil, Current Conductor Lord of AtlantisLord of Atlantis/Master of the Pearl TridentMaster of the Pearl Trident Thieving SkydiverThieving Skydiver Thieving Skydiver Seafloor OracleSeafloor Oracle Seafloor Oracle Deeproot HistorianDeeproot Historian Deeproot Historian Top 21 Merfolk Cards for Commander 21
Rad counters are put onto players, and trigger at the beginning of the first main phase of the active players turn (the one before combat)
Hes arguably the best of the five in Limited play, where his ability is a blowout and you can seek to ramp him out a turn or two early, but hes close to worthless in any non-Limited format
Mirri, Weatherlight Duelist To counteract the somewhat fragile nature of the cat-mander deck, Mirri, Weatherlight Duelist, is a Commander that nullifies your opponents creatures
Compared to some of the truly terrifying combos you can do in other games, Lorcanas biggest plays are more self-contained synergies that need a few turns to pick up steam
