Draw cards whenever your Pokmon is damaged by an attack
Synchro Summoning depends on swarming the playing field with lower level Monsters like Speed Warrior and Junk Synchron , letting you easily Synchro Summon a more powerful Monster to the field
When Clarke activates Future Fusion and declares Five-Headed Dragon as his Summon for Future Fusions effect, he can send any 5 Dragons from his Deck to his Graveyard
Nidoking has a slightly worse lead-up, with his evolutions mostly focusing on raw power, high energy costs, and a final payoff
The effect of is not a problem, but in many cases, the effect of the monster you want to negate has already been activated before you can activate it, and I remember that this effect affected the outcome of the game
Each Room card is a single card