how many mtg cards are there total Magic: The Gathering There? Is Wizards Printing Too Many

Even though the humble Negate may seem like a better exchange of mana-to-possible-counter, remember that opponents are often tapping out to cast their huge Fireball and not expecting to see a Spell Pierce countering their spell as well as a Counterspell would, anyway

Any "as [this creature] enters" or "[this creature] enters with" abilities of the creature will also work

Its activated ability probably wont come up much in 1-vs-1 Magic, but in Commander

Impulse gets you through your deck quickly, allows you to quickly search for an answer to an impending problem, and does it all so effectively that almost any blue deck capable of running Impulse in any given environment has done so without hesitation

The Demons deck is fairly straightforward, a combat-focused monstrosity making ample use of Belakors Warstorm Surge effect