Most decks dont need more than five or six lands, so holding the extras ensures you always have some discard fodder for your looters
Simic StOmPy Might Have Been Too Repetitive With Llanowar Elves, Elvish Mystic, and Gilded Goose all at the one, Simic StOmPy could play a hyper-reliable first couple of turns
Our secondary combo is Isochron Scepter imprinting Dramatic Reversal plus mana rocks that tap for at least 2 mana for infinite mana and infinite instant casts, which again is infinite damage/draw with Niv-Mizzet, Parun
Its ultimate is an emblem version of Warstorm Surge, though you could cast that card for six mana anyway and forget the hassle of getting enough counters on the planeswalker
While it must occupy your active slot to get its healing online, I cant think of many Grass decks in the TCG that wouldnt be better without a lumbering shield that not heals itself every turn, but also packs a punch