This really covers automation which we have in paper but seriously lack with MTGA. Here are some examples. Please develop more if you feel a need to.

1) So spells like Genesis Wave, there comes a time and place to select faster than clicking on each object. Maybe these are creatures in play (you want to tap them for an ability, to earn multiple activations). Select All / Ctrl+A is the default missing function here. However a Marque Select / Shift Click and Ctrl Click are all needed. When You cast X=30 for Genesis Wave, I don’t have time to click on each permanent.

2) FOR() and WHILE() functions are needed. Ideally you can record a loop and it repeats that loop. WHILE() namely for effects like a conditional self-mill, so you can Thassa's Oracle with just a few cards left. FOR() would be the main stay.

Loops that involve surveiling / scrying, please allow to AUTO:top/bottom/bin or hold priority until you accept.

RememberLastMode() is to be called when you are making a loop or doing something quick and dirty. Relic of Legends is a great example, maybe I just want to make a single colour and never any other colour. I think you call RememberLastMode() as it isn’t constantly overriding itself but rather as this is a save point, to shortcut longer actions.

RemeberLastMode() might override auto tapping. Maybe your creatures have haste and they can tap to add mana. The auto tapper will tap them last. Where I want to be tapping them now. This matters when you are creating a bunch of creatures in one turn that can add mana. Skirk Prospector also reads similarly. You amass a bunch of goblins and now want to generate large sums of mana quickly. Technically FOR() and WHILE() will do this but I’m trying to add more language for the devs.