As a sorcery, you may pay the mana cost of a locked door to unlock it.) Walk-In Closet's ability doesn't change the times when you can play those land cards
That means you should aim for at least 45 cards per person, or 360 cards total
With the proper combination (Radiant Alakazam, Xatu, Switch, etc.), you can have four Iron Valiant dancing between the bench and the Active Spot, dealing a lot of damage, and then, you can do the coup-de-grace with Laser Blade, which deals 200 damage
You may choose any number of Pokemon you find there and put them onto your Bench
Some commons appear in such close proximity that if you assume sequential collation, you could get duplicates in one pack (for example the two Poliwag on the last row, two Sentret on the tenth and two Unown E on the eighth)
I hope this helps you prep for your next Vehicle-based deck