It's not just always going to be the card beneath it
Hexproof only on your turn isnt as good as every turn, but its more than good enough, considering it stops interaction on big-swing turns
There are 10 different mana symbols, one for each color pair
or Naya (white, red, green)
If you can realistically expect to trigger your draw-2 effects at least once per turn cycle, you'll be floating a ton of extra lands into play, and your hand's already likely to be stocked given the archetype, so you shouldn't be running out of land drops any time soon
If, then, the frame is not helping anymore, change it altogether: Create and start using a new frame for the next 25 years