Cards are varying use rates. This list represents their userates from 2v2. This is about regular 2v2 and has nothing to do with Tournament Standart 2v2.
Since the card themselves are used by double the players, that means that the percentage borders are doubled compared to 1v1. There are going to be 4 again tiers that have cards. The first one is DoubleOverUsed (DOU) which has cards that have a 20% or higher use rate. The second one is DoubleUnderUsed (DUU) with a userate that is lower than 20% but equal or higher than 10%. Next is DoubleNeverUsed (DNU) with lower than 10% but equal or higher than 1%. And the lowest tier is DoubleZeroUsed (ZU) with anything lower than 1%.
Once again, if a card is on a lower tier, do not feel bad. Just the fact that the card is in a lower tier does not mean that it is bad (unless it is in DZU).
Eventually I might start hosting tournaments that play around these tiers. Any cards that are placed in lower tiers can easily be played in higher tiers. For example, in an DUU Tournament you are allowed to use cards that are placed in DNU. However you are not allowed to run cards that are placed in DOU.
Worship the 9 Titans
(Golem, PEKKA, Lava Hound, Dragon, Giant Skeleton, Scorcher, Super PEKKA, Electro Dragon, Goblin Giant)
Obey the 4 Immortal Armies
(Skeleton Army, Minion Horde, Goblin Gang, Critter Swarm)
Teach the 12 Titan Babies
(Golemite, Mini PEKKA, Baby Dragon, Lava Pup, Sparky, Inferno Dragon, Ice Golem, Balloon, Cannon Cart, Dropship, Flying Machine, Deployable Turret)
Protect the 12 Peasants
(Skeletons, Goblins, Spear Goblins, Minions, Bats, Critters, Fire Spirits, Ice Spirits, Crystal Critters, Critter Bats, Explosive Drones, Beta Minion)
Babysit the Titan Grandchild
Check my AMA here
This is my favorite discussion ever (not created by me): https://communityroyale.com/discussion/1676/how-arena-1-has-mirror-0-max-trophy#latest