Some are just low mana cost + high power demons intended to trigger ETB effects
This event is full Fri, Aug 28, 11:00am - 1:00pm Centennial Hills Library - Homework Help Center,Quiet Room,Story Room Kick off the new school year with us at the Centennial Hills Library Back-to-Homeschool Celebration event designed to support local homeschool families and all students eager to learn
Always keep this card in mulligans
Others are pointing out that in the past, certain other promo cards have been locked behind having a Premium membership, which is itself a monthly paid subscription (albeit $12/mo, with other benefits)
A card like Stitcher's Supplier contributes with 4 mana three cards in graveyard and a body, and when you add fetch lands and token makers to the list, youll start to see why Hogaak was an issue
Very, very few have good +2 effects, most are +1 if useful, and all of those are on walkers four or more mana in price