The Walking Ballista combo in Pioneer and the Spike Feeder combo in Modern are what everyone has hyped, but Heliod even functions as the Melira, Sylvok Outcast part of the Kitchen Finks / sacrifice outlet combo
But the synergies dont stop there
Subjugate the Hobbits is a pretty massive and game-ending spell, and I also like it because it represents the Scouring of the Shire, a very interesting and important part of the books that the movies left out
ZIMONE, INFINITE ANALYST Its genuinely hard for design to interest me with a UG card these days, but with Zimone, Infinite Analyst
That said, there are plenty of amazing spells in this deck to compensate for some of the weaker parts
It's worth noting that the Edge of Eternities Commander deck lists on WotC's website include a total of 12 new cards in each deck, including the commanders, compared to the usual 10 new cards