For as long as you control Kotose, you may play one of the exiled cards, and you may spend mana as though it were mana of any color to cast it
Lorehold Charm gets above the bar, mostly off of the first mode being a potential 3-for-1 in Commander
If the triggered ability is modal (that is, if it says, "Choose one " or similar), the mode is copied and can't be changed
We saw a similar issue play out with Peregrin Took, which looked like a great card at first but ended up floundering in Lord of the Rings Limited
Whenever a creature with myriad attacks a player, you get token copies tapped and attacking the other players in your pod , allowing one creature to pressure all three of your opponents in your typical Commander game
Mikaeus, the Lunarch You dont have to pump tons of mana into Mikaeus, the Lunarch to make it worth it