Whereas Draft consists of three booster packs, a cube is a set of cards (usually 180, 360, or 450, but sometimes less) that is shuffled and split into 15 card packs to be drafted
I could see myself trying this out in some decks
The cost of one mana makes it very easy to play alongside another token generator, which will more than likely put you over the threshold for the Citys Blessing
Grixis will likely continue to be a strong contender and arguably the best deck in the format going forward with the inclusion of Refurbished Familiar and that is why it is the clear winner of this set for Pauper
Ideally you want to draw two to three cards with this ability, but it will be hard to do based on having the right mix of casting costs without overdrawing and taking too much damage
Cleffa's attack costs 0 energy and allows players to draw cards until they have seven cards in their hand