Comic Strips

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 🌄 in your mana pool. 1 total mana.

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.

With those four cards you can turn 1 kill. Magic typically starts with each player at 20 life. Black lotus adds three green mana. Channel costs two, but lets you pay one life to add one generic mana as many times as you want. Mox ruby pays for the red in fireball. Pay 19 life for 19 mana, with the last green you have 20 extra mana to invest into fireball, dealing 20 damage to your opponent and ending the game.

This is a first turn win in MTG (with ridiculous old, expensive cards).

The first card on the left lets you get three free green mana (currency used to cast cards). This is used to cast the next card, which requires green.

The next card let's you sacrifice your own health and turn that into mana. This only gives colorless mana.

The third card is another free mana, this time red. One red is required to cast the 4th card.

The 4th card does enough damage to your opponent to kill them.

If you draw this hand, your opponent has zero ways to respond, and the game is no longer fun.

Been a bit, so welcome to corrections.

Assuming you get these all in your hand turn one,

Black lotus and mox ruby have zero mana cost, play those. Use the black lotus to give you two green and one of your choice to pay for channel, sacrifice 19 life to add 19 mana to your manapool. Use the mix ruby to pay the red mana cost for fireball and then use the 20 mana in your manapool as the x cost, make opponent take 20 damage and you're done.

Unless it's changed, artifacts dont suffer from summoning sickness so you can use the tap abilities out the gate.

There's some counters like Foil, Force of Will that I think could work or Misdirection. Can't recall if there's any instants that do damage that you can discard or exile cards from your hand instead of paying for because that could work too as fireball is a sorcery (if I recall how the stack works correctly)

I recall there is a similar thing you can do with haste 1r goblin and +x/+0 spell.

I thought there was a way to get the mana without that green sorcery, though I don't quite remember how

I don't know anything about Magic so I only understood half but thank you for the detailed explanation!