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Number of times the character has been in the token exchange.
10
Epic Optimus
9
Starscream
8
Shockwave
7
Rodimus
Skywarp
6
Windblade
5
Airachnia
Arcee
Ratchet
Ricochet
Sunstorm
4
Bluestreak
Dead End
Prowl
Smokescreen
3
Acid Storm
Drift
*Optimus Prime
2
Blaster
*Bumblebee
Chromia
*Galvatron
*Jazz
Scorponok
*Soundwave
Wheeljack
1
Barricade
*Bludgeon
*Brawl
*Dark Megatron
*Energon Galvatron
*Energon Grimlock
*Energon Lockdown
*Energon Optimus Prime
*Energon Soundwave
*Energon Starscream
Energon Windblade
*Goldbite Grimlock
*Grey Slam Grimlock
*Heatwave
*High Octane Bumblebee
*Lockdown
Nemesis Prime
Red Alert
*Sentinel Prime
Sideswipe
*Soundblaster
*Thundercracker
Trypticon
*Ultimate Megatron
*Ultimate Optimus Prime
*Ultra Magnus
* = only for upgrades/overpower not unlock.
So Nemesis Prime is by far the rarest. Introduced in 2015 but has only been in the exchange once.