Zoyowa's Justice

one generic mana one red mana Instant

The owner of target artifact or creature with mana value 1 or greater shuffles it into their library. Then that player discovers X, where X is its mana value. (They exile cards from the top of their library until they exile a nonland card with that mana value or less. They cast it without paying its mana cost or put it into their hand. They put the rest on the bottom in a random order.)

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Showing The Lost Caverns of Ixalan#173

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8 printings

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Zoyowa's Justice rulings

2023-11-10
If the target artifact or creature has X in its mana cost, that X is 0 when determining its mana value.
2023-11-10
A spell's mana value is determined only by its mana cost. Ignore any alternative costs, additional costs, cost increases, or cost reductions.
2023-11-10
When you discover, you must exile cards. The only optional part of the ability is whether you cast the exiled card or put it into your hand.
2023-11-10
You exile the cards face up. All players will be able to see them.
2023-11-10
If you cast a spell "without paying its mana cost", you can't choose to cast it for any alternative costs. You can, however, pay additional costs. If the spell has any mandatory additional costs, you must pay those to cast it.
2023-11-10
If the discovered card has in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
2023-11-10
If you can't cast the discovered card (perhaps because there are no legal targets for the spell), you'll put it into your hand.
2023-11-10
Some spells and abilities that cause you to discover may require targets. If each target chosen is an illegal target as that spell or ability tries to resolve, it won't resolve and you won't discover.
2023-11-10
The mana value of a split card is determined by the combined mana cost of its two halves. If discover allows you to cast a split card, you may cast either half (as long as its mana value is less than or equal to the effect's discover value) but not both halves.
2023-11-10
If you discover an adventurer card, split card, or modal double-faced card, you might be able to cast that card with either set of characteristics depending on the effect's discover value. For example, if you discover 4 and reveal Galvanic Giant (an adventurer card from Wilds of Eldraine with a mana value of 4), you could cast Galvanic Giant, but not Storm Reading (its Adventure, which has a mana value of 7). If you discover 7 and reveal Galvanic Giant, you could cast either Galvanic Giant or Storm Reading.

Zoyowa's Justice keyword rules

Discover Rule 701.55

“Discover N” means “Exile cards from the top of your library until you exile a nonland card with mana value N or less. You may cast that card without paying its mana cost if the resulting spell’s mana value is less than or equal to N. If you don’t cast it, put that card into your hand. Put the remaining exiled cards on the bottom of your library in a random order.”

A player has “discovered” after the process described in is complete, even if some or all of those actions were impossible.

If the final card exiled during the process described in rule has mana value N or less, it is the “discovered card,” regardless of whether it was cast or put into a player’s hand.