The charts below show us that Pokemon cards are a normal good, but one could have hypothesized this even earlier since cards, like much of the entertainment industry, are a luxury good that only those with disposable income can afford
He represents red mana in a great way
When you play a card with the learn mechanic, like Professor of Symbology, a prompt appears on the screen asking if you want to learn
Four mana makes it one of the more expensive rummage effects, but two cards and two Treasure tokens are too good to pass up
In these games players usually know (or have a very good guess) of what cards are likely in their opponents deck or hand
Or, pay a blue, tap, and sacrifice it when a library has 20 or fewer cards to play the removed card without paying its mana cost