Legendary Creature â Ogre Wizard
Whenever Yidris, Maelstrom Wielder deals combat damage to a player, as you cast spells from your hand this turn, they gain cascade. (When you cast the spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom of your library in a random order.)
You exile the cards face up. All players will be able to see them.
You donâ€™t have to cast the last card exiled by a cascade ability. If you choose to do so, youâ€™re casting it as a spell. It can be countered. Since itâ€™s cast from exile, Ydrisâ€™s ability wonâ€™t give the new spell cascade.
When the cascade ability resolves, you must exile cards. The only optional part of the ability is whether or not you cast the last card exiled.
The cascade ability triggers when you cast the spell, meaning that it resolves before that spell. If you cast the card exiled by the cascade ability, that spell will go on the stack above the spell with cascade.
Spells you cast from your hand this turn will gain cascade even if Yidris leaves the battlefield.
If Yidrisâ€™s triggered ability resolves more than once in one turn, spells you cast from your hand will gain cascade that many times. Each instance of cascade triggers separately; resolve one cascade trigger and the spell you cast from it before resolving the next cascade trigger.
If a spell with cascade is countered, the cascade ability will still resolve normally.