My list idea is as follows:
Gnarlroot Wargrove (+1 Artifact)
Household Battalion (+1 Artifact)
TLA - General, Oaken Armour, Gnarled Warrior, Verdant Blessing
Branchwraith- Treesong, Acorn of the Ages
Branchwych - Ranu's Lamenteri, Throne of Vines
Tidecaster ( Allies) - Riptide (Warscroll on builder says it adds 1 to hit rolls for units targeting affected unit in addition to the affected unit hitting at -1.
Archmage(Order Wizard 0-1) - Elemental Shield
Dryads x20
Dryads x10
Tree Revenants x5
Namarti Thralls x10
Kurnoth Hunters x3
Kurnoth Hunters x3
Pendulum
Cogs
Soulsnare Shackles
Extra casting of spells and boosts make this list scary. 6+++ fnp from the Archmage and woods for cover should be fun. Tidecaster Riptides a target and it gets focused down. Predatory spells are there to dictate the terms that you wanna fight on. Should be difficult for most to keep up especially since each Sylvaneth wizard can cast an extra spell a turn which means you can spend it on Endless Spells if each casts one of them as needed.
Could be fun, no?