The new LTR card [[Last March of the Ents]] is an excellent Green "Ok I'm winning now" curve-topper. I doubt it'll see much play in Modern or anything (though I'll be happy to be proven wrong!) but for Commander/Historic Brawl where you can actually cast an 8 mana spell, fantastic.
I'm a huge fan of [[Verdant Rejuvenation]] which is unfortunately Arena-only (though it would have been so easy to make the paper version [[Majestic Genesis]] on par by making it actually reveal until you get X nonland permanents). Last March of the Ents seems like an excellent sidegrade/possible upgrade depending on the deck.
I'm thinking I'll run it in [[Tiamat]]. Cast Tiamat, then next turn you draw seven and can drop all the fetched Dragons in one turn without them being able to be countered. Any other decks that would be particularly synergistic, besides just high-toughness?
Sphinx of Lost Truths?
Any high toughness creature that gives you card draw would be great to play before it, yeah. Ooh, imagine casting either Kozilek card, then follow it up next turn with Last March to draw 12. Or, like, Griselbrand, but he's banned in the only format you could really use this in (big sad).