Who is This Article For? This article is written for people who are new to Magic , or anyone who doesn't know exactly what the Stack is or how it works. If you are already familiar with the basics of the Stack and just want to know more about the intricate details of it, then check out our Stack FAQ. Of course, you could always just finish reading this article for the sheer enjoyment of it -- who knows, you may learn something.
What is "The Stack" Every time that you play any spell Creature, Enchantment, Artifact, Instant, or Sorcery , or an ability such as the ability of Prodigal Sorcerer Buy , it doesn't just "happen" right away. Instead, it goes onto an imaginary pile called "The Stack". The Stack is sort of a holding place for spells that are in "limbo" between the time you play them and the time they actually resolve a.
Most of the time, this goes on without you ever knowing it. For example, the last time that you played a Creature, did you stop to think about it going on the Stack? Probably not. And there's nothing wrong with that.
But, knowing how the Stack works may come in handy the next time that you play a creature and your opponent responds with a Counterspell Buy. Priority and The Stack Have you ever tried to play a spell at the same time as your opponent, only to begin an argument about who played their spell first?
Did you know that it's actually impossible for two players to play a spell at the same time? Magic is based on a system of priority, which prevents situations like this from ever coming up. Priority works like a game of hot potato -- it's constantly passing back and forth between you and your opponent, but only one of you has it at any given time.
The important thing to know is that you are only allowed to play spells and abilities when you have priority. To demonstrate how priority works, imagine the stack as a pile of dirty plates on your kitchen counter waiting to be washed. Both players in the game are constantly adding plates to the pile playing spells , and your mom the game is constantly taking plates off of the pile to be washed resolving the spells.
At the beginning of each step of your turn, the kitchen counter is empty there are no spells on the stack , and your mom allows the Active Player the player who's turn it is to put a plate on the pile play a spell. This is called "receiving priority". Whenever you receive priority, it means that you have the opportunity to play a spell or ability.
If you do, then it will go on top of the stack. If you don't, then your opponent will receive priority and will be given the same option. Whenever either player puts a plate on the pile, your mom will ask that player if he wants to put another plate on the pile. Return target creature to play at end of turn. This means that when castFireball was called saddlebackLagacInPlay would have evaluated to true, and castFireball would have printed:.
Saddleback Lagac targeted by Fireball. I hope this example has made asynchronous functions and the behaviour of the Event Loop in JavaScript more clear. The articles linked throughout the article will likely provide a deeper understanding of the topic if you would like to read more.
Stack abstract data type — Wikipedia. Coding tutorials and news. The developer homepage gitconnected. Sign in. The Stack in Magic and JavaScript. What is the stack and how is it used in JavaScript? And how does it relate to Magic: the Gathering? Pascal van Leeuwen Follow. Async Functions and the Event Loop. Level Up Coding Coding tutorials and news. Level Up Coding Follow. Written by Pascal van Leeuwen Follow. More From Medium. Getting started with NGXS.
Maureen Heitzmann in Pictet Technologies Blog. Adnan Aslam. React Router Paths. Wanuja Ranasinghe. Blog Post That's usually a pretty good time to make your move. The always-popular fetch lands such as Flooded Strand have activated abilities, not mana abilities.
That gives you a tiny window between when your opponent sacrifices the land and when they cast the spell they need the mana for. It's a very narrow window. Always be looking for these tiny opportunities to respond. A lot of times it won't matter, but the one time in a hundred that it does, it can make a huge difference. Throughout this article, I've mentioned time and time again that after you cast a spell or activate an ability on your turn, you get priority first, then your opponent does.
Now, this very rarely matters. You seldom want to respond to yourself. A simple example would be something like Reverberate : you want to hold priority so you can copy a spell you just cast. A slightly more complex—but still common—event you see in Legacy is casting Infernal Tutor , and then discarding your hand to Lion's Eye Diamond in response so you can go find any card.
A more extreme oldie but goodie in this space is fighting split second cards. Did you think we were going to get through a whole article on the stack without a single split second example? Let's say you cast Sacred Mesa and have six mana left. But you're worried your opponent might have a card that you can't respond to because of its split second ability: Krosan Grip. Well, you can activate the Mesa's ability in response to itself before your opponent ever gets the chance to respond!
You're then guaranteed three Pegasus tokens even if they do have the Grip. Let's say your opponent is at 6 life, and you have Imminent Doom on the battlefield and two Shock s in your hand. If you cast the first Shock , then respond with the second Shock before Imminent Doom 's first trigger resolves, it will trigger twice! Your opponent will take 6!
And you'll have a three-counter Imminent Doom to boot! Here's one of my favorite mind-benders. How can you get to draw a card with Sensei's Divining Top , but not have the Top be the top card of your library?
Here's what you do: Activate the ability to rearrange your top three cards, then in response tap the Top to draw a card. First you put the Top on top of your library, then you rearrange your top three cards. Go ahead and put that Top a little deeper down, why don't you? You can do some similarly wild things with spells—especially if you find ways to give them flash. I'll give you an example. There was a goofy combo deck that got to play two spells at the same time by way of the card Spellweaver Helix.
The two of choice? Worldfire and any spell that dealt damage. You'd put the Worldfire on top of the burn spell and have that resolve first, and then the burn spell would still be hanging out on the stack ready to finish the game. When I tap my mana and play Lurrus of the Dream- Den, it enters the Stack, and p riority , the ability to play spells is passed to the opponent, giving them a chance to react to my action.
If they do nothing, Lurrus of the Dream-Den finishes their journey to the battlefield and is cast with summoning sickness. If they choose to play a counterspell, p riority passes back to me.
This gives me the opportunity to counter their counterspell before the Stack resolves. If I do, the counterspell goes away, and Lurrus is cast onto the battlefield. Seems simple enough, but it can get very complicated. One small misstep in the Stack can have very unintended consequences. Explaining the Stack inevitably leads to honing in on this concept of priority in Magic: The Gathering.
If you have priority, you may cast a spell, keeping current context in mind. For example, during your turn, you have priority.
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