There's a couple reasons I like other options as opposed to the 2 wolves.
Hall of Triumph works really well in this build while having mostly blue creatures (in my build all but the 4x
Spire Tracer for it's evasiveness are blue).
Kraken Hatchling is deceptively good here. It pumps up
Cloudfin way more than either wolf will be able to and is much harder to kill. While normally I wouldn't run a defensive creature in an aggro build he works well with
Military Intelligence as well.
The other options I use instead of the wolves are
Quickling which will also work just as well pumping Cloudfin as the wolves, has flying to get damage through, and with Flash can be a good combat trick. I've taken out 2 attackers using Quickling while beefing up Cloudfin and blocking with both creatures. He's a great little cantrip which bring me to...
Pestermite. He can essentially be a 2 CMC creature, also with Flash and can also pump Cloudfin as easily as any of the wolves and also has flying to get past most defenses. He can untap a creature as well for other blocking shenanigans as well with his Flash.
As much as I like
Scion of the Wild I think in a deck where being as fast as possible is the best strategy, having a 3 CMC creature needing 2
can ultimately slow you down even though he has decent synergy with the numerous small creatures. Especially when overall we need more
sources than
sources and this will also make cutting those guildagtes a lot easier of a decision.
Also,
Voyage's End is an instant as well as
Vapor Snag so they can both work on the opponent's turn. But it is a tough call either way and after I do some more testing I will either decide to keep Voyage or replace it for the cheaper Snag. You certainly can't go wrong with either one.
I love talking back and forth and I have not been playing this build recently but I do plan testing it a lot more! Right now I'm focusing on fine-tuning my mono-green deck but might play with this some more after I'm done with green.