In a nutshell, this deck is made up of Pokmon that require few resources to be ready for battle and that deal a lot of damage
Overall, the Pokmon Trading Card Game is surprisingly intricate, and knowing when to use item cards is a crucial skill to learn when players first pick up the game
The important distinction between these mechanics is that you can only choose up to one alternative cost to pay when casting a given spell, but you can pay/apply many additional costs or cost modifiers as appropriate
If a Room enters from any zone other than the stack, it will enter with both halves locked
Officially, it's not legal in Eternal MTG formats - namely Legacy, Vintage, Pauper, and Commander
If you only ever adapt this once, its still two mana to reanimate an opponents creature, stapled to a hatebear