Almost every commander deck plays mana rocks and land destruction is a great reason to play an adequate amount of them
Now, I will admit that there are legitimate concerns about unbanning Splinter Twin, with perhaps the biggest being that having a combo-control deck at the top of the meta tends to drive some people a bit crazy (see: Alrund's Epiphany in Standard)
For board wipes, Toxic Deluge is the very best if you can afford it, but even cheaper options like Mutilate and Crux of Fate do a great job controlling the board
When playing against a deck built around aggressive action cards, however, Pete - Games Referee can be a powerful bulwark
The idea was that on Turn 1, you could exile a card to evoke Grief, Thoughtseize your opponent, and then, before sacrificing Grief to its evoke ability, play the reanimation spell on it