I've made mods for other games in the past but I have a feeling this one would be very-simple to create since all the pieces exist in the game currently, they just need to be put in a package. Perhaps an experienced-modder would like to give it a quick-try?

The idea would be to create a new mutator, Continuous Turns that makes each turn less of a complete reset, adding more strategy to the game:
1. 1 less mana per turn but mana persists across turns (Front-loaded; Unbroken-horn);
2. 2 less cards drawn per turn but cards are not discarded (Magic-hand; Small-hands);
3. Cards are randomly discarded every turn when the player's hand goes above 5 (permafrost cards are never discarded).

#3 might be a bit of work but it should only slightly-modify the existing game-mechanics, I think?

I haven't bought MT2 yet. Any chance there's a similar mechanic or mode there?