Your search for "basilisk collar 300" revealed the following:
Basilisk Collar (CLB) from Commander Legends: Battle for Baldur's Gate, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Craig J Spearing Card Text:Equipped creature has deathtouch and lifelink.Equip 2
Basilisk Collar (2XM) from Double Masters, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Howard Lyon Card Text:Equipped creature has deathtouch and lifelink.Equip 2
Basilisk Collar (WWK) from Worldwake, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Howard Lyon Card Text:Equipped creature has deathtouch and lifelink.Equip 2
Basilisk Collar - MM3 Reprint (PLST) from The List, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Howard Lyon Card Text:Equipped creature has deathtouch and lifelink.Equip 2
Basilisk Collar - Prerelease Promo (Foil) (PCLB) from Commander Legends: Battle for Baldur's Gate, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Craig J Spearing Card Text:Equipped creature has deathtouch and lifelink.Equip 2
Basilisk Collar (Foil) (CLB) from Commander Legends: Battle for Baldur's Gate, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Craig J Spearing Card Text:Equipped creature has deathtouch and lifelink.Equip 2
Basilisk Collar (FDC) from Foundations Commander, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Craig J Spearing Card Text:Equipped creature has deathtouch and lifelink.Equip 2
Basilisk Collar (AFC) from Forgotten Realms Commander, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Howard Lyon Card Text:Equipped creature has deathtouch and lifelink.Equip 2
Basilisk Collar - Extended Art (CLB) from Commander Legends: Battle for Baldur's Gate, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Craig J Spearing Card Text:Equipped creature has deathtouch and lifelink.Equip 2
Basilisk Collar - Cats Are Better Than Dogs (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Andrea Sipl Card Text: Cats Are Better Than DogsEquipped creature has deathtouch and lifelink.Equip 2
Basilisk Collar - 2XM Reprint (PLST) from The List, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Howard Lyon Card Text:Equipped creature has deathtouch and lifelink.Equip 2
Basilisk Collar - Cats Are Better Than Dogs (Rainbow Foil) (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Andrea Sipl Card Text:Equipped creature has deathtouch and lifelink.Equip 2
Basilisk Collar (Surge Foil) (PIP) from Fallout, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Artur Treffner Card Text:Equipped creature has deathtouch and lifelink.Equip 2
Basilisk Collar (Foil) (2XM) from Double Masters, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Howard Lyon Card Text:Equipped creature has deathtouch and lifelink.Equip 2
Basilisk Collar - Dogs Are Better Than Cats (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Rhonda Libbey Card Text: Dogs Are Better Than CatsEquipped creature has deathtouch and lifelink.Equip 2
Basilisk Collar - Extended Art (Surge Foil) (PIP) from Fallout, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Artur Treffner Card Text:Equipped creature has deathtouch and lifelink.Equip 2
Basilisk Collar - Dogs Are Better Than Cats (Rainbow Foil) (SLD) from Secret Lair Drop, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Rhonda Libbey Card Text:Equipped creature has deathtouch and lifelink.Equip 2