The Elves tend to find success in any format where there’s enough of them to make an impact. One of Magic’s most powerful tribes from the onset, Elves is a legitimate deck in both Legacy and Modern. Frontier is no exception.
In Frontier, history’s most powerful combo Elves aren’t available. You won’t be activating your Heritage Druids for huge mana development, untapping Nettle Sentinels, or using Wirewood Symbiote and Quirion Ranger to generate tons of mana. You don’t have Glimpse of Nature to churn through your entire deck or a tutor as powerful as Green Sun’s Zenith.
Panharmonicon doubles the effects of any of your creatures with enters-the-battlefield abilities. Elvish Visionary becomes a 2-mana Mulldrifter. Dwynen’s Elite will bring an entire army with him. Reclamation Sage might wipe an opponent’s entire board out. Nissa, Vastwood Seer will find plenty of extra mana. And Sylvan Messenger goes digging way deeper.
The real combo element of this deck comes from Woodland Bellower. When Woodland Bellower enters the battlefield, you get to search your deck for a green creature with converted mana cost 3 or less (nonlegendary, so no Nissa) and put it directly onto the battlefield. With Panharmonicon, you get to trigger this twice. This means you could go get a pair of Elvish Visionaries and draw 4 cards, making a 6/5, 2 1/1s, and getting an Opportunity out of the deal! Not too shabby.
But that isn’t the best you can do in Frontier Elves. Enter Shaman of the Pack. With a pair of Woodland Bellower triggers, you search up a pair of Shamans. Considering each of their triggers will happen 4 times, that’s a ton of life loss. With just 4 Elves on the battlefield, the Shamans will drain 20 life!
There are going to be many directions to take a Frontier Elves deck. In many of the stock Elves lists, they play no copies of Collected Company, so there’s room for you to take the brewing into your own hands.