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Three-mana mana rocks are often overlooked in Commander

Ive heard a lot of people saying that this shouldnt cost 8 mana, but I dont think that there is any way to justify an effect that multiplies all of your attacking creatures by the amount of opponents that you have being any cheaper than this

Do they belong to a trainer

If you want this sort of effect to influence domain, you need to look for text that actually gives your lands additional basic land types, as seen on Dryad of the Ilysian Grove and Prismatic Omen

Spikes get the most joy out of winning because the game is in many ways just a vehicle for showing what theyre capable of