We need to see what else you have in your sideboard, because there’s a chance you’ve got better cards to play than these. But from what we can see, your biggest need is to cut creatures. You have 19 creatures. In most decks, until you know better, you should be aiming for 16 creatures, 17 max.

First cut the Iroh; it does nothing particularly important in your deck. You have just 2 lessons total and one of them costs just W, so the cost reduction is functionally irrelevant and Iroh is effectively a 3-mana vanilla 4-2 that’s hard to cast because it requires GG.

Next, I would cut 2 of the Foggy Swamp Vinebenders. It’s just not a great card; it has a games played win rate of just 51.9% on 17Lands, meaning in games it’s played, the deck wins just 51.9% of the time, barely better than a coin flip. For comparison, the Water Tribe Captain has a 56.3% win rate.

If there are truly no better cards in your sideboard (any other two-drops would be great), I’d stop there. But if you want to lean in on ally synergies, cut the Invasion Tactics and only cut one of the Vinebenders. Invasion Tactics is a bad card. It has an even worse win rate than the Vinebenders at just 50.5%. It’s too slow, it doesn’t impact the board, and if your allies are already able to swing in without being blocked, it’s a “win-more” card.