There are some very nutty things in here, and I think were all hoping that this doesnt break formats
Cards related to "Full Art/Lumineon V".
Across formats, all versions of Niv-Mizzet, Reborn decks either naturally meet Jegantha's restriction or can with very slight changes (mostly to their removal package, as the Modern and Pioneer builds often play a copy or two of Supreme Verdict)
I guess it will read something like "Echoing Boon goes with Cardname." Does that mean that all the cards named with Hidden Agenda are secret to me and I can therefore apply the effect of any secret agenda to any of the secretly named cards
Of note, these have all been added to the banned as commander list so you can play them in the 99 of decks
Ruin Grinder and Flayer of the Hatebound are reprints, but theyre worth mentioning for synergy reasons