Discover can be thought of as a variant of Cascade, but where Cascade was linked to the card’s mana value and triggered when the card was cast, Discover will be written with a number next to it and can be triggered in multiple ways.
But first, the basics. When you are told to Discover, you reveal cards from the top of your library until you reveal a nonland card with a total mana value less than or equal to the Discover number. You may then either cast that card without paying its mana cost (ignoring any timing restrictions) or put that card into your hand. All other cards revealed this way go on the bottom of your library in a random order.
That’s the basic idea, but of course, there are a few notes to keep in mind:
- You may only cast a spell whose total mana value is less than or equal to the discover number. No split card shenanigans work here – if you reveal a card that technically has two different mana values, you may only cast a part of that card that meets the mana value requirement from discover.
- You are still casting the discovered spell if you choose to, so it can be countered. Also, any additional costs other than mana must still be paid to cast the spell.
Cascade as a mechanic is very powerful, powering many top-tier decks to success. Discover is a more flexible yet tempered version of that same kind of idea, so it’s likely to be pretty popular. Whether it’s as popular as Cascade remains to be seen, but don’t be surprised if this mechanic takes Cascade’s place in future sets.
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