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
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
Less exciting but still solid is Impossible Inferno
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
Copying artifacts and enchantments can get out of hand, though this is all fiddly enough that I wouldnt expect it to be too problematic
Then the recently printed Offering costs two too, also sacrifices both, and this time leaves you a Map token to either draw the top land of your library for a three for one, or give a dork a +1/+1 counter