With Variants giving out rank up gems based on year and the time that champions were released becoming more and more important I thought I might make a chart showing the years that the top champions in the current meta are from. I will attach a list in a spoiler of the champions I considered as part of the meta but I based the chart on champions that I would deem useful enough to R5.

The chart shows that from 2017 kabam started to pick up the ball on how to make some really good additions. Do note that for 2020 we are not even halfway through the year and I didn’t include Red Guardian/BWDO because it’s really too early to tell. I did however include weapon X.
Champions I included
Collosus (post buff)
Vision OG
Luke cage (post buff)
Venom
Magik
(I did not include SW as she is 4* exclusive and not useable in act 6)
Dr Voodoo
Hyperion
OML (post buff)
Quake
She hulk
Archangel
Blade
Gwenpool
Iceman
MODOK (he’s still a defensive god)
Medusa
Stark Spidey
(I didn’t include MS because she takes too long to build up to be useful in many areas. She doesn’t have the utility like Quake that means she can do almost an entire quest either)
Ægon
Cap IW
Corvus Glaive
Ghost
IMIW
Killmonger
Korg (defense)
OR
Sym Supreme
Void
(I didn’t include Proxima as she is impractical for 90% of the game)
BWCV
Cap Marvel Movie
NF
Elsa Bloodstone
Guillotine 2099
Havok
HT
IW
Mysterio
Namor
Stealth Spidey
Sunspot
Thing
Warlock
Longshot
Mojo
Sorcerer supreme
Squirrel girl
Weapon X
(Storm looks like all bark no bite but feel free to come back in a year when she is a top tier beast)