The free mechanic isnt keyworded, but it works the same way on every card
The first change is to the rules, and it is the only rules change: From now on, when the archenemy attacks any player or planeswalker on the opposing team, any creature a teammate of the defending player controls may be assigned as a blocker by that creature's controller
Decks in black and green should have plenty of access to large token makers to find a slot for this and cards leaving the graveyard also shouldnt really be an issue
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Heres how it works: you buy a digital mystery pack, open it instantly, and see what graded cards youve pulled
Ive leaned toward Kraul Harpooner and Price of Fame, despite the fact that theyre pretty narrow, because removal spells that put creatures in your graveyard a lot better than those that dont, though maybe Im fixating a little too much on Charnel Troll