Time Spiral: Rift Bolt
Rift Bolt deals 3 damage to any target.
Suspend 1 - (Rather than cast this card from your hand, you may pay and exile it with a time counter on it. At the beginning of your upkeep, remove a time counter. When the last is removed, cast it without paying its mana cost.)
Rift Bolt is part of the core of burn spells that fuel Modern and Legacy. For a single red mana, you get three damage to any target, and all you have to do is wait a turn for the suspend to wear off. Combos well with Monastery Swiftspear for big turns with piles of prowess triggers.