During your Main Phase, you can Tribute Summon 1 Spellcaster-Type monster in face-up Attack Position, in addition to your Normal Summon/Set. (You can only gain this effect once per turn.) If this card is sent from the field to the Graveyard: You can add 1 Spellcaster-Type Normal Monster from your Deck or Graveyard to your hand. You can only use this effect of "Legion the Fiend Jester" once per turn.
Amarylease will allow you to summon this card without tribute.
Dream Clown, Crass Clown, and Guardian Statue in a clown control deck all target monsters, which will make it ineffective against Chaos Command Magician. Though summoning it can be difficult if they ever get proper board control.
Commonly used in many decks, Relinquished can choose a monster to equip and gain their attack. Targeting Chaos Command Magician will get their effects negated, leaving them with no equipped monster and 0 attack.
Cards like Barrel Dragon, Twin-Barrel Dragon, and Dark Voltanis all targets a monster, which will be ineffective against Chaos Command Magician. This can be useful if used against Bandit Keith to farm him.
Cards that don't target a monster
The effects of Cards below don't target a monster. Their effects cannot be negated by Chaos Command Magician.
It clearly has DD Warrior under cards that ignore CCM's effect.
Love this card, once I summon him I just have to be careful with mirror wall, the rest is easy, 99%winrate after sumoning him, and I say that bcs I dont remember if i ever lose with him, but anyways, makes me feel so safe once I summon him, reach plat 3 with just 1 copy with a mixed beatdown deck, almost KoG,4 wins in a row then a GK deck beat me (but he suffered)
Will get more copy wherever I ser him again in the ct
Completely owns Keith. I use 2 of these, 2 Legion, 2 Gift of the Martyr, 1 Divine Wrath, 1 Soul Exchange and 1 Cost Down. I still run Mythic Depths and I left in KSH but no Angel 07. I also use 2 HWT7W plus 1 Acid Rain and 1 Magnetic Mosquito. Last turn Piranha Army, Secret Pass, GOTM both CCM and win. I have not even come close to losing to him yet.
It's alright. You can't beat the Dark Magician Girl though due to all the special summoning you can do with her through Magicians Circle and Sage's Stone but this card is still really good nonetheless.
I absolutely love this cards artwork. Hands down the best Spellcaster artwork in the game so far. You can tell Kazuki Takahashi really loves this Magician archetype. Anyway, DMG will probably always be the best 6 star Spellcaster in the game due to her Dark Magician synergy and Magicians Circle and such but I could definitely consider running this in a spellcaster deck if they ever make it into the meta.