Tier List but with Tier Descriptions

===S-TIER===
These units are the best of the best. They are powerful on their own and devestating when combined with troops that synergize with them well. If I had only one Mythic rare troop, I'd want it to be one of these.
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Infernus
Ketras the Bull
Megavore

===A-TIER===
These troops, although quite useful, don't exactly make the cut for S-tier. Most of them fill a niche, and although they can be quite powerful in that niche, they often require support or otherwise can't steamroll the enemy team on their own. They're still worth the Diamonds if you have everything in S-Tier though.
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Arachnean Weaver
Elemaugrim
Famine
Pharos-Ra
Queen Aurora
The Worldbreaker
Ubastet

===B-TIER===
These troops are the middle of the pack. They occasionally have powerful use cases in small niches (such as Guild War days) but I ultimately wouldn't consider them widely usable or worth spending lots of Gems pursuing. If you do happen to pull them from a lucky Gem Key though, you can dedicate a team to them and they can pull their weight.
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Abynissia
Champion of Anu
Gard's Avatar
Scorpius
Skadi
Jotnar Stormshield
Undine
Voice of Orpheus
Yasmine's Chosen

===C-TIER===
These mythics aren't very useful at all. These are the troops that make you wish they worked well; they ultimately don't, but they're [i]just[/i] good enough to make you feel like "hey, I can make this thing work if I dedicate my entire team to it" until you lose and realize that was a waste of time.
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Death
Doomclaw
Draakulus
Euryali
Plague
Stonehammer
Suna
The Wild Queen
War
Wulfgarok
Xathenos
Zuul'Goth

===F-TIER===
"F" is short for "Flaming dumpster in the sketchy part of town but it's a Gems of War troop."
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Gargantuar