PrintMTGs proxy/playtest cards are designed around that in-sleeve consistency idea: standard MTG sizing, familiar feel, and predictable finishing so your deck doesnt end up with one card that behaves like its trying to get caught
Theyre about half the price of most other sleeves and arent the worst you could get
Drawing three cards as an instant for a single blue mana is so ridiculous that nothing even remotely close to this card has been attempted again in Magic
Theres 28 rares, 9 mythics, the exact same cards that were nigh-impossible to find in FEA are now going to be relatively common pulls
Maulfist Doorbuster: [Category 2] ETB yield is 2 Energy for 4 mana, then you can spend 1 Energy to cause a creature not to block
Combined with a playset of Temur Battle Rage and multiple copies of Become Immense, the deck would regularly get a Splinter Twin-esque win out of nowhere with a big, double-striking trampler