Youre not attacking with your saprolings unless you have to, though youll still get the death triggers either way
The next TCG set to release after the Pokmon GO crossover is the Lost Origin expansion, which was accidentally leaked early on the Pokmon Center store
1 - Unlikely to see play
Hot Magma needs one Fire Energy card and one of any type of Energy card (the symbol shown next to the Fire Energy is known as Colorless, so any Energy card will work) in order to be used
For me, research involves deepening my understanding of the Pokmon subject and deciding on the composition to use
That being said, keep in mind, cards like Auriok Sunchaser, Glint Hawk Idol, Carapace Forger, Rusted Relic and Embersmith are much weaker if your deck isn't chock full of cheap artifacts