The reason I have picked out Rakdos Charm is that it does two niche things while still having some more general applications
The smaller your creatures and the wider your board, the more of an impact Mirror Entity will have
With the addition of Unholy Heat to Modern, not even Lightning Bolt has been able to fully withstand the power creep of the last few years, and I personally would place it below Unholy Heat in power level when taking into consideration the context of the Modern metagame
This isnt all it does though
Using your ruler and the tip of a mechanical pencil without any lead poking out, score* two lines down the middle of the card, with about 1/4 to 1/2 between the two lines.** *Scoring (in this case) simply means making a dent or crease in the paper, so that it will fold more easily
Your main line of play centers on Robin Hood himself, who excels at drawing extra cards and generating Lore at the same time