mtg 1000 card box Is this worth it? (Context in the comments) : r/mtg or 640 standard 20pt trading cards 1000 Mtg Cards - Etsy

Some three mana counterspells do see play in the cube, mostly this is down to the distinctly finite number of unrestricted hard counter magic you can find for two mana and not because the cards themselves are super good

Its hard to quantify an answer to that question, but Id guess that Gray Merchant of Asphodel is in the top five black game-enders ever

Blistercoil Weird Captive Weird Compleated Conjurer Fluxcharger Frostburn Weird Gelectrode Hydroelectric Specimen Melek, Izzet Paragon Melek, Reforged Researcher Petrahydrox Resonance Technician Spellgorger Weird Spellkeeper Weird Steamcore Scholar Steamcore Weird

Easily one of the quickest ways to mill out your opponent while simultaneously putting a fair amount of power on the field, Sword of Body and Mind easily outclasses many other 3-mana equipment