Quote from Djinon
I've been playing Summoning Trap decks since it was printed and I always worried about how you would get around someone playing Iona if you were G/W yourself. They'll name white, end of story. Now, they've got an out. I should hate this card, but I love playing green, and I've been waiting for this card for a long time. I never thought I would see it because of Wallop, and if so at GG for flavor and balance, but here it is. Awesome.
I had a Green-White deck, and Iona was one of the problems the deck had. The Iona player would almost always name white to stop all the white removal in my deck. Before Plummet came out, Lignify was the only low casting cost way of dealing with Iona.
This card definitely boosts monogreen decks, since green historically has poor anti-flying removal and direct creature removal.