Countering spells is almost always a crime, but with a couple of exceptions
Its not the same as it was five or even three years ago
Mutant Menace has everything you need in a precon
Oftentimes, these cards are fun spinoffs of real Magic cards, such as No Mercy and Snow Mercy, and Mishras Workshop and Mishras Toy Workshop
Later in the game, Awakening Hall gives you a lot of value (or a lot of sacrifice fodder to keep doing the thing)
Chrome Mox Zuran Orb Brainstorm Sensei's Divining Top Mystical Tutor Spell Pierce Swords to Plowshares Fire/Ice Lightening Helix Snapcaster Mage Balance Isochron Scepter Remand Arcane Denial Lat-Nam's Legacy Disenchant Trinket Mage Timetwister Jace, the Mind Sculptor Elspeth, Knight Errant Gideon Jura Temporal Mastery Terminus Bonfire of the Damned 16 Lands (I cannot be bothered to work out a sensible mana base for a deck I'm not going to battle with, sorry