return 1 of your banished Level 8 Synchro Monsters to the Extra Deck, then you can Special Summon that monster from the Extra Deck, also you can only attack with "Malefic" monsters for the rest of this turn.
While initially introduced in the Black & White TCG expansion, this card type became truly fleshed out in the Scarlet & Violet era
A longtime fan-favorite Legendary, its dynamic illustration and strong playability keep it in the top 10
Each time you proliferate, you can choose any permanent that has a counter, including ones controlled by opponents
One of the most optimal ways of doing this was Thunder King Rai-oh, and it was so powerful that players were only able to use one copy in competitive formats for a long time
It's more of a new way to handle an existing ability that we've seen fairly frequently