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
Even without the requisite devotion Klothys stacks up a lot of little effects all at once
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
Additionally, you are very likely (but not guaranteed) to get more Avatars within the booster packs themselves
In all honesty, fat packs and bundles are my favorite ways to enjoy the paper version of a new set because it strikes the perfect balance of product variety, number of booster packs, and price point