If you mash these two numbers together and account for the rarity difference, the average value of opening a single box topper in a Double Masters box is $49.16, but since we get two box toppers with each box, box toppers actually add a massive $98.34 to the expected value of a Double Masters box
The deck functions exactly the same as the $50 version, just with better cantrips, tutors, ramp, and a more consistent mana base Check Out Laboratory Maniac's Budgetless Brew
Like I don't know if it's burning down a whole lot of Gruul four-ofs, but I can totally see two copies in some decks, and all four in total seventy-fives
#4 I half feel like propping up Nicol Bolas/Cruel Ultimatum.dec would be an interesting asymmetric 3-colour deck incentive, rather than adding a whole bunch of 3-colour stuff
But another reason for its popularity is that Tinybones is actually a very powerful Commander