While mana rocks, mana dorks, and land ramp are some of the most common forms of ramp you play against, cost reducers are a class in and of themselves that deserve respect
Sure, theres only a chance of this happening, and it does reveal information, but its nevertheless a very potent effect
If you do, create a 1/1 black Bat creature token with flying
You have several must counter cards as well as lots of hard to remove threats complete with ramp and abundant draw
At the lowest of the low, you can play Windfall for a wheel, you can play any of the cheaper Coastal Piracy effects, or you can just copy whatever the strongest draw is at the table, and play Mirromade
Discover, meanwhile, allows players to exile several cards until they find a non-land card they want to summon or add to their hand