This isnt about reprinted cards (buy after three months) or Reserved List cards (if it didnt spike already, its a buy) but only about new, in pack cards
In Boros, Rakdos, and Gruul, Sneak Attack can be a major win condition
Chaos Orb There are currently only 8 Collectors Edition Chaos Orbs available for sale on Cardmarket, which already describes its popularity quite well
Haste : When you next activate an ability this turn by spending four or more mana to activate it, copy that ability
Thranduil, the Elvenking
You see, for the first couple years of Magic, the color red was largely a support color, primarily contributing burn spells, artifact and land destruction, and a variety of niche spells for special occasions