This is a wild turn one combo that will win if both players have the same starting life. Assume 20 life each, you play the first card to give you 3 green mana, you play the second card using 2 green mana. This card let’s you use 19 of your life for mana leaving you at 1 life and 19 manager + 1 from the previous card. You play the third card which gives you one red mana (totals are 20 green, 1 red) and finally now you can use the last card by paying one red and X (X can be any number you choose as long as you can pay it). In this case X is going to be 20, for the 20 green you had dealing a perfect 20 damage to the other player leaving them at 0 life and yourself at 1 life.

This combo works for whatever life total as long as yours is greater than or equal to Theirs