Brass's Tunnel-Grinder // Tecutlan, the Searing Rift

Nov 10, 2023 · 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.

Nov 10, 2023 · 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.

Nov 10, 2023 · You choose how many cards to discard as the first ability of Brass's Tunnel-Grinder resolves. You may choose to discard no cards and just draw a card.

Nov 10, 2023 · If a permanent spell cast using mana produced by Tecutlan, the Searing Rift has {X} in its mana cost, use the value chosen for X when calculating that spell's mana value.

Nov 10, 2023 · If the discovered card has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.

Nov 10, 2023 · 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.

Nov 10, 2023 · You exile the cards face up. All players will be able to see them.

Nov 10, 2023 · Abilities that begin with "At the beginning of your end step, if you descended this turn" will trigger only once during your end step, no matter how many times you descended this turn. However, if you haven't descended this turn as your end step begins, the ability won't trigger at all. It's not possible to put a permanent card into your graveyard during the end step in time to have the ability trigger.

Nov 10, 2023 · 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.

Nov 10, 2023 · Tecutlan, the Searing Rift's triggered ability will resolve before the spell that caused it to trigger.

Nov 10, 2023 · Multiple cards have abilities that begin with "At the beginning of your end step, if you descended this turn." These cards don't need to have been under your control at the time you descended. For example, if a permanent card is put into your graveyard during your first main phase and you cast Stalactite Stalker your second main phase, its ability will trigger at the beginning of your end step.