That keyword is called exhaust, and just like your NOS bottles, you only get to use it once before its gone for good
For example, commanders that care about this are Araumi of the Dead Tide by putting a certain creature in our graveyard or The Gitrog Monster by putting a land into our graveyard and letting us draw a card
Making your adversaries discard is awesome, but what if they dont have any cards in hand
In addition, since you are placing free permanents on the battlefield as would older "free" token generators do, the potential for your plays to snowball into a huge payoff is looking rather consistent
Next, youll need to sift through your bulk a second time to determine if any cards among them are worth a teensy bit more
What is the Van Gogh Pokmon card