1) , has everything.
2) , has everything except for counterspells.
3) , has everything except for A/E hate, counterspells, and good early ramp.
4) , has everything except for hard boardwipes, tutors, or direct damage.
5) , actually doesn't have a lot of things, but can stop and/or copy most of relevant stuff, and has b..hing lategame.

prove me wrong

1) has the best CA, Ramp, Removal, Recursion, and Control
2) has the best CA and ramp, solid recursion and control, and decent removal and finisher potential
3) has the best CA and ramp, excellent control, and solid recursion
4) has the best CA and Ramp, Solid recursion and control, and only somewhat limited removal
5) has the best Ramp and Recursion, Solid CA and Removal, but limited control.

has the best ramp, recursion and removal, and some CA and control. Best non-blue combination.

Now pick the best Voltron combo.

WUBRG for Tazri food chain, WUBG for Hulk Flash, WBRG for Blood Pod, Grixis for Kess Storm, Esper for Zur and mono blue for Teferi.
Idk which one to exclude from the top 5.

I feel like naming sultai is cheating coz' WR doesn't really do much in EDH to begin with.

It's less "top 5 combinations" but more of "bottom 2 worst colors"