Arbitrage is particularly close on Aether Vial I could see this one jumping in price in the near future, especially with the next wave of Modern tournaments coming up early next year
Best Card Draw Payoffs While card draw is one of the few mechanics and resources that doesnt really require any other engines or payoffs to work, there are some specific creatures and cards that make drawing cards even better than before (if you can believe it)
As a strictly better version of the original fight spell, Prey Upon, Tail Swipe can actually be cast at sorcery speed during your main phase in order to get a marginal +1/+1 boost for your creature ahead of its tussle with a foes creature which just might be the difference between your beater living or dying
The situation with the day/night imbalance very likely has to do with its Eldrazi prisoner
Tutors, fast mana, and infinite combos generally arent played in this tier
Then sacrificing dorks for cards became a thing and now Black usually either sacrifices dorks or pays life for card draw