Spell Contortion

In Commander, Spell Contortion earns a slot in any Eldrazi-heavy blue deck — the density of colorless creatures makes the ward reduction realistic by turn four or five, and the cantrip means running it never costs you a card. In Legacy and Vintage, the bar for counterspells is set by Force of Will and Mana Drain, so Spell Contortion is too conditional and too slow to compete unless you're explicitly building around Eldrazi synergies. Modern Eldrazi shells are the one constructed home where it has a credible argument, though even there the format's speed pressures two-mana interaction heavily. Pioneer, Standard, and Pauper are not legal, so the card lives and dies in Commander for most players.