Treacherous Merchant

As long as Treacherous Merchant is tapped, artifact spells you cast cost {1} less to cast.
{t}, Pay 2 life, discard a card: Gain control of target nonland permanent with converted mana cost 3 or less. Use this ability only any time you could cast a sorcery. Any player may activate this ability during their turn.
At the beginning of each player's upkeep, untap Treacherous Merchant.