A new Forbidden/Limited List has been announced for Master Duel, which will start applying on April 30th (by the time the new Ranked Season begins):

Forbidden:
Instant Fusion

Limited:
King of the Swamp
Foolish Burial Goods

Semi-Limited:
Change of Heart

No Longer Limited:
Sky Striker Ace – Kagari
Supreme King Dragon Darkwurm
Thunder Dragonhawk

Fire Formation Tenki

As usual, you can get a bonus for dismantling the cards that had their max number of allowed copies reduced, until the 8th of June.