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The keyword here is destroy, meaning it does not negate and the ability will still resolve

Without haste, it's a little vulnerable for one turn while the summoning sickness passes, but if your opponent doesn't have a response, it's a brilliant card to have in your deck

Once per battle, during damage calculation, if this card battles an opponent's monster with an equal or lower Level (Quick Effect): You can make that opponent's monster's ATK 0 during that damage calculation only

Yidris, Maelstrom Wielder gives cascade to all the spells you play each turn after hes dealt combat damage to your opponent, which at some point will inevitably end up in a storm of random spells to enter the battlefield all in one turn and cause a huge mess