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If youre changing decks too often, maybe you too should consider sticking to one of them for a while

Honorable Mention: Hedge Shredder Hedge Shredder gets the honorable mention because the lands you play from the graveyard basically need to be milled in order for you to replay them

Once a creature becomes monstrous, it can't become monstrous again

Scion of the Ur-Dragon is a five mana WURBG 4/4 Dragon with flying that is great for either casual play or silly combos

If the target is illegal as Legions to Ashes tries to resolve, it will be removed from the stack and do nothing, even if there are tokens with that name still on the battlefield

Deputized Protestor is a 2/1 Red Human Warrior that costs two generic and one Red mana to cast