He was too high up the curve for the effect and not enough body for the mana
I am much looser with my cube than most and will happily add in 20 cards and take out none
In just the last couple of days, similar card sheet issues were reported by players on Reddit
#4 SeekerofSecrets *card selection xD Also, I could easily see Neoform using this, but because really only one of its pieces can be found with this, and some lands, and that piece could already be Summoner's Pact ed for, I doubt this is anything too special for that deck
(I would like to think that Unsubstantiate for only spells would be common because it's very much worse than multiple uncommons.) Meanwhile, Comply is also unique, but it certainly isn't rare, considering that Silence costs the same amount of mana and keeps an opponent from casting anything for a turn, while Comply requires you to "guess the right card" for it to have any effectand even if you guess right, it only stops one card
The fact Rift Elemental was a mere 1 mana immediately leapt out at meit could be tutored a number of ways, from White's Ranger-Captain of Eos, to any number of Green means to fetch Creatures