mtg meta commander decks Magic: the Gathering or unleash Eldrazi to devour all in your path with Eldrazi Incursion Wizards of The Coast Magic:

Even if you gain control of your opponents Artifacts, reaching the 20 Artifact requirement should still be very hard

They may do something else with their turn besides kill Nissa, thinking they have another turn until shes actually a threat, but Ulvenwald Hydra typically throws a wrench into their plans

That could easily be a 5/5 or 6/6 bonus to your Commander plus the boosts and equipment from other places for a Commander kill in one hit, or two with two attacks

Copying artifacts and enchantments can get out of hand, though this is all fiddly enough that I wouldnt expect it to be too problematic

These formats have access to almost all cards from Magics history , so players who are interested in playing need to have pretty big collections to get involved

Graded Population Report: Wakka, Devoted Guardian [Foil] #97 Visualize the distrbution of grades in the chart