After re-discovering Latias on my save file, I started looking up cards that featured Latios and Latias
The player going first cannot draw or attack
I'm betting it was Slivers
ICONIC CHARACTERS & CONTENT: Features cards from multiple Star Wars eras, focusing on spies, politicians, criminals, and covert agents to add new depth and strategy to your decks
The deck plays too many level five Digimon, so Mirei allowing you to Digivolve for a reduced cost from the trash and DNA Digivolve at the end of your turn can be a huge problem for your opponent to deal with
The theory is that, as Yedora3 brings back non-token creatures as face down and lands, the ability does not remove the interaction between Morph or disguise and being face down - I can morph in a creature, turn it face up for effect, throw it at the enemy to get it killed, bring it back as a face-down card that is a forest, then flip it face up (again) for its morph cost