mtg play of the game card DND Mat Mat Assist (Another player can pay up to 6 of this spells cost.) Exile all nonland permanents. Let's Play a Game

The Great Henges mana cost is reduced by X generic mana equal to the greatest power among creatures you control

Boneyard Mycodrax Corpsejack Menace Corpsejack Menace Fungal Behemoth Fungal Shambler Fungus Elemental Fungus Sliver Fungusaur Lichenthrope Mindbender Spores Mold Demon Mycoid Shepherd Mycoloth Sowing Mycospawn Sproutback Trudge Swarm Shambler Xavier Sal, Infested Captain

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The only real downside that this card has is that your opponents are able to cast their own Dauthi Voidwalkers and gain access to the cards that you've exiled from other players

Finally, black has some great cheap removal in the form of Shriekmaw and Hero's Demise