While on the field, each of them continuously negates a specific type of card's effect that the opponent resolves in the same column as a friendly "Mekk-Knight" monster: "Key" negates Traps, "Secret" negates monsters, and "Whispers" negates Spells
Sort Before You Sell A little organisation can make a big difference
They are no longer the main chase
It literally takes every permanent off the board and makes every player choose 7 of them as a starting hand of sorts, while shuffling away everything else
There is a card or particular set of cards for everyone, granting players much versatility and choice as they carefully create their decks
Its a great blink target, and later in the game, you can transform it into Kefka, Ruler of Ruin, a strong flier that can draw you so many cards just by attacking and dealing damage