Quote from Invisible StalkerArbor Colossus isn't a card. Deadbridge Goliath was a 5/5 for 4 that scavenged, Loxodon Smiter was mainly seen in sideboards and Call of the Conclave wasn't seen. Just because it's p/t is above the curve that doesn't make it good.
And for Devotion, that implies that Nylea would be played, and that that deck couldn't do better, which it could easily (BTE)
I'm convinced then. Arbor Colossus will always be monstrous at the perfect time, isn't easy to remove, is very consistant and impacts the board state early and significantly.
I hardly think that Nylea and Arbor Colossus will dominate standard however, even independantly of each other. And playing one solely because of how it benefits the other isn't going to improve the deck overall.
Quote from yanloupHatebears/D&T is THE deck to play Vial. If you don't, just trade or sell them.
Far less essential in Merfolk.