#infamousktf

[mtgtutorials]

Sorry if I've been bombarding you guys with questions lately but I've found this account to be the most helpful when it comes to MtG questions. Regarding Vampire Hexmage: If I sacrifice the hexmage to remove all the counters on a planeswalker, would that planeswalker's loyalty counters go to zero or back to the printed number?

To zero. A planeswalker’s printed loyalty just defines how many counters the planeswalker enters with. Those counters can still be removed.

[mtgtutorials]

Can I cast a Hero's Downfall after my opponent casts a planeswalker but before he activates it's ability?

That depends on whether your opponent gives you the opportunity. Any time a spell or ability resolves, the active player (whoever’s turn it is) is the first player to get priority (the chance to do things).

So in your example, after the planeswalker enters the battlefield (assuming it’s your opponent’s turn, which it probably is if they’re casting a planeswalker), your opponent gets priority again. If they choose, they can immediately activate one of the planeswalker’s abilities (again, assuming it’s their main phase and there’s nothing else on the stack). Once they do that, you can cast Hero’s Downfall in response to the ability — but at that point, the ability is already on the stack. Hero’s Downfall will destroy the ‘walker, but then the ability will still resolve.

On the other hand, let’s say your opponent doesn’t immediately activate a planeswalker ability, and instead announces they’re going to move to the next phase of their turn (or cast another spell, or activate an ability of another card). In that situation, you’d get priority in response to that action, so you’d be able to cast that Hero’s Downfall before they used any of their planeswalker’s abilities.

Priority is a very complicated topic (as is the stack in general), so if this doesn’t make 100% sense, feel free to ask any followup questions you need to. I also recommend checking out my older tutorials, specifically:

MTG Tutorials #1: What Is The Stack?

MTG Tutorials #2: All About Activated Abilities

MTG Tutorials #4: What Is Priority?

You can also find a list of all of the tutorials I’ve done here. Most of the fundamentals of the game rules are covered there, along with keywords from the core sets, Return to Ravnica, Gatecrash, Dragon’s Maze and Theros.

[mtgtutorials]

Is there any way to get rid of emblems?

Nope. Once an emblem is created, it persists for the rest of the game.

EDIT

anerdtumblr said: 

Karn can restart the game removing the emblems :v

Yes, okay. Karn restarts the game in its entirety, so I suppose you can consider him a way to get of emblems. He also resets players’ poison counters, life totals and commander damage.

A better way to think of this is that Karn is restarting the game. That game where you had an emblem is over now.

[mtgtutorials]

If a creature with auras and equipments attached to it got exiled by Oblivion Ring, would the attachments get exiled with it? And if not, when it re-enters the battlefield, would the equipments go back on it without paying the equip cost?

No and no.

Auras and equipment that are no longer attached to something they can legally enchant/equip immediately “fall off”. For Auras, this means being put into their owner’s graveyard; for Equipment, this means leaving them on the battlefield but unattaching them from the creature they were attached to.

Auras and Equipment never follow the creature into exile or back unless a card specifically says so.

[mtgtutorials]

If a planeswalker was exiled with Oblivion Ring, would it re-enter the battlefield with the same number of loyalty counters as when it was exiled?

No. It will enter with a number of counters equal to its printed loyalty.

As a general rule, any permanents that leave the battlefield will lose their counters as they change zones. They will not have any counters on them when they come back unless something specifically causes them to enter with the counters (such as planeswalkers’ starting loyalty number, or the abilities on Bloodfray Giant or Astral Cornucopia or Bramblewood Paragon).

[magicjudge]

I have a Vraska the Unseen with 7 loyalty counters and my opponent casts Oblivion Ring on her. When I destroy the Oblivion Ring, does Vraska return to the battlefield with the 7 loyalty counters she had or does she go back to her regular 5? And is it the same if she was at 2 loyalty before exile?

Planeswalkers always enter the battlefield with counters equal to their printed loyalty (barring effects like Doubling Season, of course.) 

An object that changes zones becomes a new object with no relationship to its previous existence. Vraska has no loyalty counters when she's exiled.

[mtgtutorials]

For Koth of the Hammer's +1 ability: If it was activated while no Mountains are tapped, can it still be activated? Will it still turn into a 4/4 creature?

-- EDIT -- 

Apologies everyone, I misread infamousktf's question!

The answer to this question is yes, you can target an untapped Mountain with Koth's first ability. The only restriction for "Untap target Mountain" is that it has to target a Mountain. Note that untapping something that's already untapped doesn't do anything, but the land will still be turned into a 4/4 creature.

If the ability said, "Untap target tapped Mountain," you would not be able to legally activate it targeting anything but a tapped Mountain.

Sorry again for the confusion!

[mtgtutorials]

After sacrificing Quest for Pure Flame, would the double damage apply only to all the damage after it has been sacrificed or would it double all the damage that was dealt within that turn/phase?

Sacrificing Quest for Pure Flame creates a replacement effect which lasts for the rest of the turn. If a source you control would deal damage while that replacement effect is around, instead that source deals twice as much damage. 

Sacrificing the Quest does not retroactively double any damage dealt before that point.