My opponent, playing as paladin. Chose to use a deck that would imbue his hero power. So an “emerald portal” was shuffled into their deck, that is “Cast When Drawn”. When they played the 1-Cost card “Dragonscale Armaments” (Draw a spell that started in your deck and one that didn’t), it burned the “Emerald Portal” which was supposed to be “Cast When Drawn”
not a bug. There were 10 cards in the hand, so drawing cards was impossible
Drawing with a full hand doesn’t draw cards, it burns them instead, so it doesn’t activate draw effects