chucky mtg card Magic The Gathering Secret Lair X Foil Edition Chucky - Kardur, Doomscourge Commander

Mercurial Chemister is particularly awesome because, even though most of the time it will be used to draw cards, the discard effect could prove useful as removal too

Creature Standard Pioneer Alchemy Historic Timeless Competitive Brawl Historic Brawl Constructed Standard Stats 50.7% 0.0% 46.9% 69 Limited Final Fantasy Stats 52.3% 13.5% 50.9% 4,500

You could be getting 10+ +1/+1 counters on each creature you control with ease

Its not just a cEDH card, though

Most Cube-worthy big creatures dont tend to do very well unless they have some sort of incidental value (which you could argue that Wolfir Silverheart has)

No other booster seems as appropriate