Mox Pearl Seven versions of Mox Pearl exist, though its most expensive printing is from the 1993 Alpha set of Magic: The Gathering
Typically, the combo works as follows: Discard a creature card via Tortured Existence to return a creature from your graveyard to your hand
These decks are then put to the test against other players' combinations
On top of this threat, you can mill and ping your opponents with rad counters, and gain great advantages from interactions from the milling effects
A great example is Aetherdrift , where the zombie faction played a huge role and really boosted the tribes presence, so it's worth looking at those to uncover zombie hidden gems
However, the following is a very rough guide of what one might find desirable in a commander deck: The full list for the Planar Portal preconstructed deck is available here