Can be easily negated as well.... a greatly placed solemn warning or solemn judgement will kill off mask change , leaving your acid in the side deck XD
MY best combo is summoning Evil hero dark gaia with dark fusion
Since i used dark fusion he cannot be destroyed by effects of cards, and if i had Evil hero wild tornado on the field with dark calling
ahemm i could easily attack with gaia switching all def monsters to atk not activating flip effects.... then attack directly with wild tornado and all spells/traps you control are destroyed.