HOW DOES KING CRIMSON WORK

HOW DOES KING CRIMSON WORK is blue.
All "Take an extra turn" effects are cancelled.
Undo all cards played this turn and all cards played this turn are not played.
HOW DOES KING CRIMSON WORK does not effect itself.
"ALRIGHT FINE YOU WANNA KNOW FINE I ADMIT IT I DON'T KNOW KING CRIMSON WORKS HE ERASES TIME
BUT WHAT DOES THAT MEAN IF YOU ERASE TIME THEN SHOULDN'T IT NOT BE THERE WHAT DOES THAT
MEAN WHAT DOES HE MEAN HE ERASES TIME HE ERASES TIME BUT STUFF STILL HAPPENS IN IT HOW DOES
HE K