The downside of using high mana cost creatures is that you're going to need some expensive mana ramp to actually cast them, something that Commander precons historically have not included
Duergar Hedge-Mage Speaking of good Boros cards, Duergar Hedge-Mage sees practically no play at only 2% of decks, which is frankly absurd when you look at the more popular Boros Commanders
Thus the solution to the Winter set squeeze wouldnt be a relocation of the Fall set, and it wouldnt be a cancellation of the holiday break, but a softening of the Two-Block Paradigm to a Greater Block / Lesser Block model, the likes of which were already potentially seeing in action
Blood Tithe
Nevertheless, a cards official Rarity can always provide a baseline for determining value, particularly for recent expansions that have yet to experience the effects of time
You need to kill three opponents at forty life for a total of 120 damage