To explain this to the uninitiated:
(First follow another explanation of the original combo)
In Magic spells are not in effect immediately, instead they go on the stack, before they are resolved. Spells from a stack are resolved in LiFo order, so last in, first out. Instants, like Gut Shot, can be put on the stack at any time by any player (simplified).
So Enemy gets his 21 mana with channel, you let that resolve, he has 1 life. He pumps it all into the fireball, now you act. While fireball is on the stack you cast Gut Shot, paying with 2 life of your 20. It goes on the stack. Your enemy hopefully has no response, without any mana left in his pool, and he looses his last life and the game.
When a player looses the game all his spells are removed from the stack, so you really win and there is no draw.
You stopped his combo with 4 cards worth unreal amounts of money with a single card worth about 50ct.
Mox Ruby is free to play with a 0 casting cost. Tap that (turn it sideways) to add 1 mountain (red mana: 🌄) to your mana pool. You don’t remove it from the board.
You have 1 mana in your mana pool: 🌄
Black Lotus is free to play with a 0 casting cost. You can turn it sideways, remove it from the board into your graveyard pile, and add 3 of any color to your mana pool. Choose green for forests: 🌲🌲🌲
You now have 4 total mana: 🌄 🌲 🌲 🌲
Channel costs 🌲🌲. Cast that, remove 🌲 🌲 from the mana pool, and pay 19 of your 20 starting life, so that you gain 19 colorless mana (can be used for most spells). Place Channel into the graveyard pile.
Your mana pool will now have a total of 21 mana: 🌄 🌲 + 19 colorless
Fireball costs 🌄 + any amount of mana you decide, up to how much you have available. So you then use your remaining 🌲+ 19 to do 20 damage to your opponent.
Every time this comic gets reposted it gives me an opportunity to, in turn, post this.
Response.
To explain this to the uninitiated: (First follow another explanation of the original combo)
In Magic spells are not in effect immediately, instead they go on the stack, before they are resolved. Spells from a stack are resolved in LiFo order, so last in, first out. Instants, like Gut Shot, can be put on the stack at any time by any player (simplified).
So Enemy gets his 21 mana with channel, you let that resolve, he has 1 life. He pumps it all into the fireball, now you act. While fireball is on the stack you cast Gut Shot, paying with 2 life of your 20. It goes on the stack. Your enemy hopefully has no response, without any mana left in his pool, and he looses his last life and the game.
When a player looses the game all his spells are removed from the stack, so you really win and there is no draw.
You stopped his combo with 4 cards worth unreal amounts of money with a single card worth about 50ct.
?
Yeah, I’d like a breakdown as well. I definitely don’t know enough about MTG.
You start with 20 life.
Each of these spells must be played on your turn.
Mox Ruby is free to play with a 0 casting cost. Tap that (turn it sideways) to add 1 mountain (red mana: 🌄) to your mana pool. You don’t remove it from the board.
You have 1 mana in your mana pool: 🌄
Black Lotus is free to play with a 0 casting cost. You can turn it sideways, remove it from the board into your graveyard pile, and add 3 of any color to your mana pool. Choose green for forests: 🌲🌲🌲
You now have 4 total mana: 🌄 🌲 🌲 🌲
Channel costs 🌲🌲. Cast that, remove 🌲 🌲 from the mana pool, and pay 19 of your 20 starting life, so that you gain 19 colorless mana (can be used for most spells). Place Channel into the graveyard pile.
Your mana pool will now have a total of 21 mana: 🌄 🌲 + 19 colorless
Fireball costs 🌄 + any amount of mana you decide, up to how much you have available. So you then use your remaining 🌲+ 19 to do 20 damage to your opponent.
You win with 1 life remaining.
This was the only comment that actually explained it. Thank you.