The main spotlight for this deck is the Overgrown Snapvines. The idea is to dominate the field with the Snapvines and if you can cast Iceborn Legacy at least once, you'll have tanky bombs guarding your nexus.
Early game uses low cost allies to chump block enemy strikes. The First Wave deals with that well. Last wind with Cursed Keeper makes a powerful sudden strike. Better reserve the Ephemeral summons for late game.
Catalyst of Aeons provide sustainability with this game as well as getting you closer to having 7 mana for that first Snapvine.
Babbling Bjerg assures you draw a Snapvine to prepare for the onslaught.
Once you have a Snapvine, the fun begins. As long as you have one still alive, you can easily dominate the board as long as you have the right cards:
Hapless Aristocrat, the First Wave, Cursed Keeper, Blighted Caretaker, and Onslaught of Shadows insantly gives two more Snapvines at a very low cost.
By this time your Maokai should be close to leveling up, and each sapling will generate another Snapvine at your disposal.
The Undying should die each round here, growing each round so you'll have a monster if ever your Snapvines get eradicated.
The Neverglade Collector is quite OP with this deck, as you'll kill your own units and drain for each of them, even if the enemy tries to whittle down your forces as long as you save the Collector and at least one Snapvine.
This deck is fun for me and I see a lot of possible versions of it. Maybe Thresh could be added, or Kalista, or Even Nasus if you want to deviate from Freljord. There is a great potential with this deck, personally, and I think its weakness might be hard aggro or faster scaling decks, as well as those that can destroy multiple targets at once.
3.15
Shard Cost: 
22,500
32
8
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