By attacking together with the Characters played using "OP12-094 Monkey.D.Dragon", your opponent will have a tough time defending.
These are special cards that arent released in booster packs, so theyre technically not sets you can buy
Thanks to this, theyre unlikely to find their way into every green decks 99
Ive always thought Myr Propagator is a bit too slow for what it does spend three mana to make another 1/1 Myr that does the same thing but in this deck, extra bodies pick up Urtet +1/+1 counters, and Myr Propagator also benefits from Urtets untap ability
When you play him, aim to boost his Resist so that he can last longer when challenging your opponent
[1] It was illustrated by Atsuko Nishida, one of Pikachus original creators, and only 39 copies are believed to exist, making it the rarest and most expensive Pokmon card in existence