Amethyst vs Amethyst matchups typically involve complex sequences of playing Genie - Wish Fulfilled, Elsa - The Fifth Spirit, Belle, and now the new Dumbo - Ninth Wonder of the Universe
Then if all else is equal you will win
Mufasas A Delicate Balance ability lets you exert all your cards in your inkwell in exchange for bouncing two cards randomly back into your hand
Then you can tap it, put a burden counter on it, and draw as many cards as it has burden counters
Sources: TCGPlayer (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
If you have any doubts, try to understand on which turn a card is good, how much mana or how many resources you need to optimize it, and how many similar cards you already run