The big issue with Magic (for me) is planning how to spend all my mana, calculating which cards to play in which order, and then--I forget. The entire thinking

The big issue with Magic (for me) is planning how to spend all my mana, calculating which cards to play in which order, and then--I forget. The entire thinking dissipates into thin air! This after taking 15 minutes for a turn really convinced me I need to train my brain to handle stacks and to memorize the cards. Even a spreadsheet where I can input mana pool and current hand (click, click, click to select), which generates what can be done (maximal allocation) would be neat (for non-tournament play).