Manafeeder panthara didn't draw

I had Heart of Vir’naal, and used it before playing Devoted Maniac and Manafeeder Panthara. Maniac worked as usual, summoning two rush elementals, but the manafeeder didn’t draw me any cards. It did the sound of a battlecry activating (twice), but afterwards I still only had the two cards I started with

I experienced the same: Mana Feeder doesn’t work after you play a Galakrond trigger card (Shaman)

I can attest to something similar while playing a Highlander Quest shaman deck. I used the hero power to double battlecries, played shield of Galakrond first which functioned as normal, then saw the boarder around Manafeeder Panthara in my hand go from yellow to green. I played it anyway but it didn’t draw me any cards.

Manafeeder Panthara didn’t trigger although the upgraded shaman quest hero power was used.

Same issue for me today. Heart of Vir’naal, Devoted Maniac, Manafeeder Pathara, zero card draw.

its a known issue