Sanguine Sacrament has that boost, as its an instant, gains you double X life, and gets put back into your library for later reuse
If you want to check some of those out, Commander Spellbook has even more combos for daring players to consider
Watermark: Judge Academy Illustrated by Martina Fakov Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Legal Comp
Cursed could be used on an opponent's creature, making for a potentially crippling tactic
Its a seriously powerful effect, though, considering it copies both instants and sorceries and permanents in blue
Beyond the Four-Colour decks, the card also sees play in Esper Reanimator, where you look to blink creatures like Grief, Solitude, Mulldrifter and Archon of Cruelty