Thats because it reads, Choose target instant or sorcery spell
You can draw lots of extra cards by discarding your lands and then get them directly onto the battlefield the following turn
The Ozolith The Ozolith is one of the most well-known counter cards in Commander, and runs between $30-40 a copy at the time of writing
Green has a lot of creature tutor effects and land tutor effects, the best in the game on both accounts I would say
The treasure generation should help somewhat, but when your other options can cheat multiple equip costs, it's hard not to go with those options instead. Tidus, Yuna's Guardian Counter Blitz (Final Fantasy X) Source: IGN Counter Blitz focuses on counters, and you may think it was inspired by Blitzball given the name but according to Holt, the deck is more of a reference to FFX's Sphere Grid experience system
At all points of the game, you need to know what your deck can do