It doesn't fit into a Control shell either, as the first chapter of Summon: Esper Maduin cares about permanent cards, not instants or sorceries
Even if the deck failed to outright kill in one turn, that failure didn't use up all your resources, so you can try again later
Play Booster Boxes (including 12 packs) aren't much better, reaching close to $1000 on the resale market right now, so buying in bulk isnt exactly economical either
A crafty opponent might bounce the creature that currently has Deadpools text box, returning it to their hand or exiling it, which hands the life-loss problem back to you
Green-black mostly falls on the less-aggressive side, though, since its big advantage comes from attrition through removal
Even without the requisite devotion Klothys stacks up a lot of little effects all at once