Basilisk Collar (1920) [Secret Lair Drop Series] March of the Machine Set: March of the Machine:

Set: March of the Machine: The Aftermath Type: Legendary Artifact Creature — Golem Rarity: Mythic Cost: {5} Karn

Set: Unhinged Type: Basic Land — Island Rarity: Common ({T}: Add {U}

[-5]: Destroy all other permanents except for lands and tokens

Set: Secret Lair Drop Series Type: Instant Rarity: Rare Cost: {3}{U}{U} You may exile a blue card from your hand rather than pay this spell's mana cost

Set: World Championship Decks 1998 Type: Land Rarity: Rare Whenever City of Brass becomes tapped

Basilisk Collar (1920) [Secret Lair Drop Series] March of the Machine Set: March of the Machine:Set: Secret Lair Drop Series Type: Artifact Equipment Rarity: Rare Cost: {1} Equipped creature has deathtouch and lifelink. (Any amount of damage it deals to a creature is enough to destroy it. Damage dealt by this creature also causes you to gain that much life.) Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.) That collar isn't an accessory it's a warning.