how many mtg cards are there total Magic: The Gathering There? This guy completed every single

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

Obzedat's Aid Oh Dragon's Maze , what an awful expansion you are

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