Historical Rules · 18 June 2010
Rule 702.78a
Official source text from the 18 June 2010 Rules release
Retrace appears on some instants and sorceries. It represents a static ability that functions while the card with retrace is in a player's graveyard. "Retrace" means "You may cast this card from your graveyard by discarding a land card as an additional cost to cast it." Casting a spell using its retrace ability follows the rules for paying additional costs in rules 601.2b and 601.2e-g.