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Dryad Arbor can't be cast as a spell
Red is hurt a bit more by depth, and late picks may struggle with it at points as cards like The Fall of Kroog, Mishras Onslaught, and Bitter Reunion are varying degrees of playable but not ones that make you particularly happy to see in general
The Unfinity set has a couple options too, but just about all of them are weak uncommon Draft fodder
The extra part of generating mana of any color gets better if you have changelings, aliens, or doctors
This was an excellent decision