You cant play Corruption unless your deck is mono-black or really close to it, but once you make that commitment, it quickly becomes the best card in your deck
It magnifies, massive, damage that can be split up, like Arc Lightning into dealing 9 damage, and it increases damage to foes and their things only, so Red mass burn damage like Pyroclasm will deal four to your foes, but only 2 to your stuff
That means you can have this three mana Black and Green Planeswalker at the top of your deck
(2023-10-13) If something refers to your commander while you have two commanders, it refers to one of them of your choice
Thunder Junction in particular gave players a new-found reason to care about the Mercenary creature type, since it's one of the five types encompassed by the 'outlaw' batch