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Wolfbriar Elemental A 4/4 creature for four mana is on the mana curve, so even if you dont kick Wolfbriar Elemental its going to be a decent creature
Arbor Elf has seen a fair amount of competitive play, often alongside Utopia Sprawl
The extra part of generating mana of any color gets better if you have changelings, aliens, or doctors
Dryad Arbor can't be cast as a spell