You should have been clear in what you intended to say.
2mana 1/5 posionous with taunt is actually incredibly strong.
5 mana 4/6 charge taunt is also very strong.
Getting a 5/5 stats off of 4 mana with wild growth attached is also very strong.
Hell, they're all very strong. You're just used to the broken power levels that druid enjoys atm to think these synergies are not strong.
My point however is largely that it's brokenly strong with spells which it shouldn't be. Doublling the power of a spell for 4 mana, that also gets a 3/5 is quite over the top imo. At 4 mana it should not have that power. Perhaps 5 or 6 mana is more appropriate for that text. I am not concerned with whether the card is even played, there are a ton of balanced but not played legendary cards.
Except none of these are true. It's a 2-card combo that costs 4 + the card you are playing. Is a 2-mana 1/5 poisonous taunt good? Fuck yeah, it is!
But really it's 6-mana for a 3/5 and a 1/5 poisonous taunt across two cards. Is that still good? It's okay. It's nothing amazing or great. It's certainly not worth crafting a legendary over. Neither is 9 mana for a 3/5 and a 4/6 taunt charge. Hell, Call of the Wild is better than that, and it's just one card!
I already agreed that Fandral is probably overtuned. But my counter-point was that in any given set, a LOT of cards will be overpowered, and a LOT of cards will be underpowered, because a lot of this is meta-dependent. Unless it's breaking the game or causing a meta black hole, I don't think it's worth addressing. Antonidas, with the right setup, turns into a 7-mana card that gives you infinite fireballs. That's game-determining, but still not worth nerfing.
In the current meta, here are the cards I really think are potentially worth addressing:
Jades (as a mechanic)
Innervate
Ultimate Infestation
Patches (but more importantly, Ship's Cannon in Wild)
Murlocs
DK Anduin
Plus something from Aggro Druid, though I don't even know what. Maybe Innervate would be enough to keep it in check - it would be healthy to make that change and let it roll for a while.
Skulking Geist is something I wish would just get straight-up deleted, and I think we both have similar feelings of distaste for that card.
We'll see how Bonemare turns out. It's definitely an extremely strong card. Someone in the Wild Discord joked that a common is now better than Dr. Doom, and I can see where he's coming from.