You can open MAR cards in Play boosters and Collector boosters
Beseech the Mirror could act as additional copies of The One Ring in Modern by sacrificing the artifact you've already used
How about the white-blue-black Obscura, sneaky mystics and fortune tellers
While this could be as low as something like three if you're getting Ureni into play with a card like Natural Order, I think this is much more likely to be in the six to seven range, especially if we're ramping this into play
Second, while youre protecting your best creature from Phyrexian Scriptures by making it an artifact, youre also making it more vulnerable by introducing a weakness to artifact removal like Vandalblast, Cleansing Nova, or Reclamation Sage
You can also respect the power of early drops by playing more board wipes, which Ill always advocate for, especially as most three and four mana wraths will knock out the vast majority of the cards spoken about today