In decks that can manage its triple green cost, Tribute to the World Tree plays like a less-absurd The Great Henge, which is one of the most powerful green card advantage engines
While Batterskull has long been the best friend of Stoneforge Mystic, the printing of Kaldra Compleat added an even deadlier threat to the Artificers toolbox
That means spells like Lightning Bolt, Chaos Warp, or Vandalblast get a second life, no mana needed
Inti, Seneschal of the Suns a personal favorite, but cards like Monument to Endurance and Containment Construct are just as useful
If your opponent, say, plays Pacifism on an Army, you'll just keep making it bigger and bigger (while losing life) rather than spreading across the board laterally like you would with the awesome blossom