Between Powder Heal , Potions, healing attacks, and Erika, Grass can become nigh-unstoppable, healing from anything and everything, especially if you pair it with Grass best attackers like Venasaur EX and Exeggutor EX
Ive found its main use is to pick up a damaged Bisharp to use later in the match
7: You get an emblem with "At the beginning of your upkeep, you may cast a legendary spell from your hand, from your graveyard, or from among cards you own in exile without paying its mana cost." 3: Exile target nonland permanent
This also requires players to discard two energies
Considering the above, I guess every player have a small list of cards they still like/wish to play disregarding their effect
We do have Lorwyn Eclipse coming and I would assume five color reanimator for elementals is on the way