The Frog package of Dupe Frog, Swap Frog, and Ronintoadin also works with the Paleozoics to make their own Xyz Monsters like Paleozoic Opabinia to use Paleos from the hand and search for them, or Paleozoic Anomalocaris for removal each turn, though both Xyzs do prefer if you get at least 1 Trap attached to them as material, which of course would be the Paleozoics
Although I tend to lean toward Pokmon Secret Rares that have more of a scene depicted in their art, I do like what artist Yoshioka did with this card
These commanders are uncommon, so you can even use this pairing in pEDH
When you start mixing in black cards that can self mill it becomes very easy to transfer large portions of your deck right over to the graveyard
Avacyn, Angel of Hope, depicts the archangel of the frightful plane, created by Sorin Markov to protect the plane of Innistrad