Trying to make a 75% deck to have fun with, but not too competitive/unfair, while also being relatively affordable.

For the above reasons, I would prefer not to play: ABUR Duals, Zendikar Fetches, Cascade Bluffs (although I sucked it up for Sunken Ruins, and Graven Cairns is cheap), Consecrated Sphinx, Ancient Tomb, Snapcaster Mage, Mikokoro, Forced Fruition, Mind over Matter, Tutors, Time Spiral, Timetwister, Yawgmoth's Will.

Or anything that doesn't let other players actually play the game, like Leovold, or Myojin of Night's reach. Cards like Mind's Eye or Rhystic study seem a little too good/take over the game too easily. And I'm personally not a fan of Phyrexian Tyranny of Spiteful Visions as they hurt me also.

That said, looking for advice, improvements, suggestions, particularly with the mana base which feels a bit weird to me and I think I need more blue sources.