Dual lands are lands that can produce two different colors of mana through their mana abilities, which makes them a core part of multicolor deckbuilding
The closest legal comparison to GriselbrandGriselbrand would be NecropotenceNecropotence, which is already a Game Changer, but the steps necessary for exploiting GriselbrandGriselbrand are far less demanding than the hoops required to jump through to break NecropotenceNecropotence
None of the cards above (save for perhaps Ephemerate) have seen much complaint about imbalance or oppressiveness
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Command Beacon, essentially, gives you a one-time pass to cast your Commander without paying the Command Tax
Tazri also has an activated ability that costs a full WUBRG (one of each mana color), which grants your Ally creatures +X/+X where X is the number of colors among those creatures