Theyd only be able to do their first venture into the dungeon trigger each turn, which hinders them from gaining more in-game value with the permanents they control
But Zenosmore specifically, Shinryu, Transcendent Rivalonly needs to remove one player, and its not like flipping Zenos is hard
With such a potent answer like Unholy Heat, most of the creatures and Planeswalkers are easily answered, so decks have to play a lower curve threat package to not trade big mana threats against a single Unholy Heat
Also, Im not a huge fan of poison, and dont exactly want to see it overrun the format
24-Pack Box Experience: Configured with 5 cards per pack and 24 packs per box, the format is designed for extended opening sessions and consistent variety
If you want a second easy path, Krenko, Mob Boss is another classic starter option, though the Krenko decklist ranked up above is tuned for cEDH