Here are the four key reasons why card stock matters: Durability Card decks are meant to be used repeatedly, shuffled, passed around, and handled over time
Esper Control is probably the third most-popular deck in the format right now, but is Chromium likely to be more of a mirror-breaker in the sideboard, or a versatile maindeck threat
Once Platypus-Bear has attacked, it will remain an attacking creature for that combat, even if the Lesson card is removed from your graveyard
It should go down even further, but the bottom price could be somewhere around $7-10, and that's something one should not overlook
This simple-seeming card has multiple roles
For Constructed Magic, though, that darn if you play a card, bury Juju Bubble clause is a huge dealbreaker