My submission is really simple, but extremely powerful, slowing down the game for both players which helps prevent combos and forces its removal to be expensive if you don't already have big threats on the board
Wanted to see a giant with Inspire because its a pretty cool feature, placed at 10 cost so inspiring him won't start to be a problem till your next turn is what the main balance is here, also giving him 0 attack to help even out his potentially devastating inspire attack!
Synergy: Every taunt minion, every minion just before they are to trade
Ancient of War: 4/13 - Lorewalker Cho: 0/7 - Magma Rager: 4/4 - Big Game Hunter: 3/5.
If a minion takes 3 damage with the Emerald Tree buff, then the Emerald Tree dies, the buff disappears but the minion's Health goes back to normal, because minions take damage first from their buffs before their original Health.
Would love to have this as Neutral, but only Druids can grow a giant tree with the blessing of the Emerald Dream quickly.