This is where I make a pun on losing track of these and get nuked from orbit.
The missing cards in the Lost Art Promotion for the latter half of 2021 have been revealed:
LART-EN037 Barrel Dragon
LART-EN038 Storming Wynn
LART-EN039 Gemini Elf
LART-EN040 Enchanting Fitting Room
LART-EN041 Elemental HERO Burstinatrix
LART-EN042 Foolish Return