There's nothing more frustrating than mana droughts and mana floods dictating the outcome of a game.
Magic Arena is plagued with this issue. In the 25 years I've been playing mtg, I've never experienced so many games whose outcome is determined by mana problems. This can result in both my defeat or my victory, but win or lose, it results in a horrible play experience for me and I'm assuming for my opponent as well.
It's unfortunate this is the case. I fundamentally love mtg. It's absolutely ridiculous that every other game I find myself either drawing 7 lands in a row, or none at all until turn 4 or 5. I pride myself on very carefully balancing my mana, and using this truly magical thing called probability to tune my deck.
Magic Arena appears to have no regard for mathematical probability.