Before this card was unified under this name, there were professor cards with different names that also shared the same effect, and, due to ruling issues, the Professor's Research cards were created to stop future issues if The Pokemon Company wanted to print professor cards
One example is how Vendread Battlelord is a mix of Omega Spawn and the Nemesis T-Type
They can be used to heal your Pokmon, draw extra cards from your deck, or increase your Pokmon's attacks
And of course, Harvester of Souls draws cards
If the Sculler hits a removal spell, its easy to kill the Sculler instead of a Dragon, since they know theyre going to get another removal spell for the Dragon thats threatening to kill them
Its not hard to make Sprigatito cute, but the one here lounging in its bed certainly qualifies