Here is The Arena's Viability Ranking of Cosmics from OP Rank to F Rank. OP is the most useful choice on your team and F is not recommended. Only Cosmic monsters are covered in this ranking.
This list is based around monster's performance in The Arena (PvP), NOT Team Wars, Duels, etc. The monsters are also ranked at Rank 5.
These monsters are the best of the best in the cosmic metagame, and are highly recommended to anyone seeking a good cosmic.
|Bombeta||Chuckle Muckel||Cryocrawler||Fampirastral||Lindworm||Lord Platypus||Shelly||The Dooo|
These monsters still perform well in the cosmic meta, but are held back from OP due to one or more flaws.
These monsters are good picks in the cosmic meta, but are held back from the higher ranks due to multiple flaws, or not having a devastating gimmick.
|Diegael||Lightmare||Nahane||Noahgnarok||Ophiuchus the Zodiac||Rody||Solarflare|
|Blackfeather||Calamedic||Ferrus||Iguanazaur||Kaih the Sunmelter||Krampus the Killjoy||Luponudo||Roost Waine|
|Steamwrath||The Dreamer||Ullrica||Undead Mr. Beast||Varupapu|
These monsters are okay, and decent picks in the cosmic meta, but, they have multiple flaws holding them back.
|Anton Acosmic||Bingxen||Captain Alvid||Fract-Bot||Henritch||Kraster||L1ght||LazarBeam2099|
These monsters are not that good, due to one or more major flaws, and are not recommended for anyone seeking a good cosmic monster.
These monsters have serious flaws and are outclassed by some of the best original mythics.
These monsters should not be used in any situation, and are outclassed by a good portion of the original mythics.