Free spell

Free spell is Magic jargon for a spell which can be cast without paying mana for it. Free spells usually have an alternative casting cost

Examples

 * Pitch spells
 * Spells which have phyrexian mana costs.
 * Time Spiral Pact cycle cards are free the turn you play them, but require the caster to pay mana at the beginning of the next turn's upkeep or lose the game.

Although certain spells of the Urza block are commonly known as "free spells", these spells with the free mechanic are pseudo-free spells, since the net effect is having the same number of lands untapped. However, they cost mana to cast, and the land untapping effect only happens if they resolve.