Granted, the cards aren't exactly the same, but Awakened Inferno sort of does everything Flamecaller does but better
In TMNT, it was abundantly clear when you were pulling a source material card because they were so different from the rest of the set
Shadowmoor also showed off another asset of hybrid, this time in Draft
Think about Runeclaw Bear and Reach Through Mists stapled together, so you get to have both effects while only costing one card out of your hand
Casual players often dont bother with premium versions of cards, but still drive prices on non-foils when a card is popular enough
This years promo draws inspiration from holiday cinema, with references to the 1988 Christmas classic, Die Hard, plus Home Alone, Eight Crazy Nights, and more