pokemon booster box in store Pokémon TCG: Mega Evolution—Pitch Black Display : Toys & Games Mewtwo ex Pokemon - Scarlet & Violet:

There is no restriction on card type within the same deck

Now, mind you, this is very much an art/name only kind of promotional deal

Here: Creatures (23) Lands (26) Spells (12) Mysteriously, I sense this is not the only three-cost green enchantment that makes 1/1 tokens when the condition is met in this set Crawling Sensation is another delirium enabler (thanks to the self-mill ability) and a payoff for your other delirium enablers (giving you random 1/1s here and there)

Lastly, note that "mana cost" was originally called "casting cost" up until the release of the Sixth Edition core set, which brought a number of important rules and terminology changes