After drawing your opening hand and putting a Basic Pokmon card face down, the next six cards of your deck are put off to the side face down as "prizes." Each time you knock out one of your opponent's Pokmon, you get a reward: putting one (or more) of your prize cards into your hand
There were thousands of them
Unfortunately I have no video to confirm it, but at that time I had not yet open any Series 2 pack, so no way to mix them later by accident.
It was previewed by our own Commander VS team, with no one more excited about its contents than Jeremy
During Pokmon Checkup, place 16 damage counters on that Pokmon instead of 1
If you want to play a longer more mid-to-lategame style deck in Mono Red that interacts more with the table, well, it gets more challenging because it makes Mono Red's inherent weaknesses more glaring: subpar card draw and ramp, subpar answers to creatures, minimal options for enchantment removal, commander protection, and recursion, things that get more pronounced as the game progresses