While an opponent could attack you once to simply destroy the Truce it's low value to do that before getting at least one card
Let's compare this list against both the average Marneus CalgarMarneus Calgar and the average Spirit deck to see what we gained (and lost) in the process
Additionally, its rarity is Uncommon, meaning youll have a significantly higher chance of getting one in your deck
Like most Magic: The Gathering cards, the value of Sanctum of Serra depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Planechase Planes)
The key difference is no Mutagenic Growth, which means no turn one kill
I dont plan on having too many ways to deal with it, because it isnt a card that sees much sideboard play, but I could see that changing in the future