Your search for "thoughtcast 81" revealed the following:
Thoughtcast (MRD) from Mirrodin, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Greg Hildebrandt Card Text:Affinity for artifacts (This spell costs 1 less to play for each artifact you control.)Draw two cards.
Thoughtcast - Borderless (SPG) from Special Guests, available at 401 Games Canada. Rarity: Mythic Rare Finish: Normal Artist: Lucie Louxor Card Text:Affinity for artifacts (This spell costs less to cast for each artifact you control.)Draw two cards.
Thoughtcast (Foil) (MM2) from Modern Masters 2015, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Greg Hildebrandt Card Text:Affinity for artifacts (This spell costs 1 less to cast for each artifact you control.)Draw two cards.
Thoughtcast (Foil) (MRD) from Mirrodin, available at 401 Games Canada. Rarity: Common Finish: Foil Artist: Greg Hildebrandt Card Text:Affinity for artifacts (This spell costs 1 less to play for each artifact you control.)Draw two cards.
Thoughtcast - Borderless (Foil) (SPG) from Special Guests, available at 401 Games Canada. Rarity: Mythic Rare Finish: Foil Artist: Lucie Louxor Card Text:Affinity for artifacts (This spell costs less to cast for each artifact you control.)Draw two cards.
Thoughtcast (DDF) from Duel Decks: Elspeth vs. Tezzeret, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Greg Hildebrandt Card Text:Affinity for artifacts (This spell costs 1 less to cast for each artifact you control.)Draw two cards.
Thoughtcast (TRC) from Star Trek Commander, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Camille Alquier Card Text:Affinity for artifacts (This spell costs 1 less to cast for each artifact you control.)Draw two cards.
Thoughtcast (BRC) from The Brothers' War Commander, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Greg Hildebrandt Card Text:Affinity for artifacts (This spell costs 1 less to cast for each artifact you control.)Draw two cards.
Thoughtcast (FDC) from Foundations Commander, available at 401 Games Canada. Rarity: Common Finish: Normal Artist: Greg Hildebrandt Card Text:Affinity for artifacts (This spell costs 1 less to cast for each artifact you control.)Draw two cards.
Thoughtcast - Borderless (First-Place Foil) (SPG) from Special Guests, available at 401 Games Canada. Rarity: Mythic Rare Finish: Foil Artist: Lucie Louxor Card Text:Affinity for artifactsDraw two cards.