Brass's Tunnel-Grinder // Tecutlan, the Searing Rift
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Legendary Artifact // Legendary Land — Cave

When Brass's Tunnel-Grinder enters the battlefield, discard any number of cards, then draw that many cards plus one.
At the beginning of your end step, if you descended this turn, put a bore counter on Brass's Tunnel-Grinder. Then if there are three or more bore counters on it, remove those counters and transform it. (You descended if a permanent card was put into your graveyard from anywhere.) // (Transforms from Brass's Tunnel-Grinder.)
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Whenever you cast a permanent spell using mana produced by Tecutlan, the Searing Rift, discover X, where X is that spell's mana value.
standard future historic gladiator pioneer explorer modern legacy pauper vintage penny commander brawl alchemy paupercommander duel oldschool premodern
Rulings

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.
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.
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.
In either case, it doesn't matter if those cards are still in that player's graveyard.
You exile the cards face up. All players will be able to see them.
Tecutlan, the Searing Rift's triggered ability will resolve before the spell that caused it to trigger.
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.
Some cards refer to a player who has "descended this turn." This means that a permanent card has been put into that player's graveyard from anywhere this turn.
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.
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.
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.
In either case, it doesn't matter if those cards are still in that player's graveyard.
You exile the cards face up. All players will be able to see them.
Tecutlan, the Searing Rift's triggered ability will resolve before the spell that caused it to trigger.
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.
Some cards refer to a player who has "descended this turn." This means that a permanent card has been put into that player's graveyard from anywhere this turn.
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