What it does
Discover N lets you exile cards from the top of your library until you reveal a nonland card with mana value N or less. You then either cast that card for free (without paying its mana cost) or put it into your hand. The rest of the exiled cards go to the bottom of your library in a random order.
The big nuance: discover is not a cast trigger by itself, and the free cast it offers is optional—but if you do cast it, you can still pay additional costs and choose modes, X is treated as 0, and you can cast it even if you normally couldn't. Also, you keep digging past lands and high-cost cards; you only stop at the first qualifying nonland card.
In Commander, discover shines with cheap, high-impact spells and big payoff cards. Watch for whiffs—if nothing in your deck has mana value N or less, you exile your whole library, so build with your discover values in mind.
Iconic cards with Discover
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