Heres how it technically works: You cast an instant/sorcery with in its cost, lets say Banefire
A sealed product loses enormous value if it is damaged, exposed to sunlight, or humidity
In the past, the only thing we had to do this was Strength Charm (which was only ever really played in Ludicolo DX/Magcargo DX)
I would be fascinated to see how Vengevine stacks up against Mother of Runes and Serra Avenger or Goblin Lackey and Gempalm Incinerator, but my impression is that decks with green one-drops have never been that great against fair creature decks without some sort of over the top finish, whether its a reanimation effect or a Natural Order or something else that puts a huge board-defining creature into play
It has its own dedicated group of followers, its own events, and is particularly popular across Europe
No matter how hard you try, it will absolutely never be as valuable as, say, Dryad ArborDryad Arbor