Rules: Deathtouch and Fight — Why One Damage Is Enough

Short answer first, then the reasoning — that is how rules questions deserve to be answered, because you usually need this ruling in the middle of a game.

The answer

Yes, deathtouch works fully with fight effects, and it is one of the cleanest interactions in the game once you see why. Deathtouch is a property of damage: any amount of damage dealt by a source with deathtouch to a creature is lethal damage, even a single point. A fight makes each creature deal damage equal to its power to the other — real damage, dealt by the creatures themselves — so a small creature with deathtouch that fights a huge creature still deals lethal damage to it, while taking the huge creature's full power back in return. The deathtouch creature usually dies too; the trade is the point. Equipment or effects that grant deathtouch at instant speed can turn a routine fight spell into a removal spell, which is why experienced players ask about it before declaring fights casually.

The cards involved, on their real text

Questing Beast (mana cost {2}{G}{G}; Legendary Creature — Beast; 4/4; rarity: mythic; most recent printing listed by Scryfall: Throne of Eldraine): Vigilance, deathtouch, haste
Questing Beast can't be blocked by creatures with power 2 or less.
Combat damage that would be dealt by creatures you control can't be prevented.
Whenever Questing Beast deals combat damage to an opponent, it deals that much damage to target planeswalker that player controls.

Prey Upon (mana cost {G}; Sorcery; rarity: common; most recent printing listed by Scryfall: Ultimate Masters): Target creature you control fights target creature you don't control. (Each deals damage equal to its power to the other.)

Build and check your list with the MTGBrew card database, and browse every card mentioned here in the MTGBrew Learn guides on MTGBrew.

If this topic is on your bench, keep going with Heliod, Sun-Crowned Commander Spotlight: What This Legend Brings to the Command Zone — it covers the neighbouring decisions from a different angle, and the two pieces together give you a fuller picture than either one alone.

Keep reading

Keep reading: Heliod, Sun-Crowned Commander Spotlight: What This Legend Brings to the Command Zone and Tymna the Weaver Commander Spotlight: What This Legend Brings to the Command Zone.

Why this keeps coming up

Most rules confusion is really wording confusion: two game words that sound similar — destroy and exile, damage and life loss, target and choose — mean different things, and the difference is deliberate. When a ruling surprises you, read the exact words on the cards involved, in the order a judge would. Nine times out of ten, the text already contains the answer, which is why MTGBrew's guides quote oracle text instead of paraphrasing it from memory.

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