Professor's Research has been a staple since the Sword & Shield era, and has been able to remain as one of the best Supporters despite the aggressive power creep between generations
Once transformed, it becomes Polukranos, Engine of Ruin, which is a 6/6 with reach and lifelink and reads: Whenever Polukranos, Engine of Ruin or another nontoken Hydra you control dies, create a 3/3 green and white Phyrexian Hydra creature token with reach and a 3/3 green and white Phyrexian Hydra creature token with lifelink. Even without any other hydra creatures, the fact this card will split into two is amazing - but with some clever deckbuilding, it could make your deck unkillable
"Cryptic Command," "Arcbound Ravager," and "Aether Vial," are all punching above their weight, generating more dollar volume than their average retail price would indicate
Despite featuring an eclectic mix of Pokmon, its perhaps unsurprising that Pikachu is the most valuable card from that years promotion
It will definitely vary from what you will end up building