pokemon astral radiance card set New Pokémon Collection Announced counter dice The Most Valuable Astral Radiance

Yamask can be obtained from Mega Rising: Mega Gyarados pack in the Mega Rising set

There are cEDH versions Im not sure I believe in here

The answer is always no. Copies of spells dont get cast most of the time, which is what effects like this care about

But certain energy cards may be rare due to their scarcity or limited availability

"These are all kids, young adults, who are playing the game, treating it as a game in the late 90s, early 2000s and they're now in their 30s and 40s," Goldin said

Addendum If you cast this spell during your main phase, you may put a permanent card with mana value 7 or less from your hand onto the battlefield