My biggest recommendations would be to max out on Intrepid Adversary and grab 2-3 copies of Adeline, Resplendent Cathar
Leaf-Crowned Elder Yet another Treefolk standout from 2008s Morningtide set, this card is an absolute banger in the right circumstances, especially if you can duplicate your upkeeps through something like Paradox Haze or Shadow of the Second Sun but why do that when you can just swing for the fences with an unstoppable army of anthropomorphized trees
Morska, Undersea Sleuth Im not going to pretend like Morska, Undersea Sleuth is that powerful, but I like it
MTGO.com
Since then, several of these unique creature types have been supplanted with other, more-appropriate or more-established creature types or been entirely removed in successive iterations of errata and the Grand Creature Type Update
They serve to give your side of the board tempo by allowing your creatures to attack (removing defenders), giving you more time to set up the board (removing attackers/expensive creatures), and allow for combat tricks (saving your creatures after damage is on the stack
