Arc Blade is a uncommon Sorcery card from Future Sight (FUT), collector number 94. Current market price: $0.31 (foil $0.76), TCGplayer market prices via Scryfall.
Arc Blade deals 2 damage to any target. Exile Arc Blade with three time counters on it. Suspend 3—{2}{R} (Rather than cast this card from your hand, you may pay {2}{R} and exile it with three time counters on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost.)