Based on community opening data, a Japanese box is expected to contain at least one SR (Super Rare) or higher per box, with realistic chances at SAR and MUR pulls
In step 2, there are no replacement effects to be applied
On the other hand, you risk losing strong, archetype-specific cards
These include cards such as Avatar Aang (flying, firebending, transform), Aang, at the Crossroads (Ally fetch, transform), Boiling Rock Rioter (firebending, Ally reanimate), Earth King's Lieutenant (+1/+1 counters), Fire Lord Zuko (firebending, +1/+1 counters), General Tazri (Ally fetch, anthem effect), Hakoda (cast Allies out of your deck, protection), Katara, the Fearless (double triggers), Katara, Water Tribe (vigilance, 1/1 counters, waterbend), Sokka (menace, prowess, 1/1 tokens), and many more
Each card will be placed in a plain sleeve
Players can't respond to your choice of +1/+1 counter or haste, and they can't take actions while the creature is on the battlefield without one or the other