P/T Number 166 Language English Legal Formats Commander, Legacy, Modern, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Pauper, Pioneer, Standard, Timeless Rulings (3/19/2021) The ability that defines Tarmogoyf's power and toughness works in all zones, not just the battlefield
Return of the Wildspeaker is another solid option, especially given it can be cast in response to removal
The drawback, of course, is Tevals insistence on taking a toll every time you cast a spell, shaving away life equal to its mana value
(6/10/2022) If your commander loses the choose a Background ability or stops being a Background during the game, as appropriate, it is still your commander
As for the Side Deck, it contains 3 copies of cards that are all useful in the current meta
Entire packs and boxes are off-centered or close enough to count