Helm of the Host (Retro) [The Brothers' War Retro Artifacts] Illusionist Draconic other Rats you control get

other Rats you control get +X/+X until end of turn

each opponent discards a card

Set: Monarch Edition: 1st Edition Finish: Cold Foil Type: Weapon Subtype: Scythe (2H) Rarity: Majestic Class: Runeblade Power: 3 Once per Turn Action - [3 Resource]: Attack Whenever you attack with Dread Scythe

or if it's just a special card for MagicCon Philadelphia

Helm of the Host (Retro) [The Brothers' War Retro Artifacts] Illusionist Draconic other Rats you control getSet: The Brothers' War Retro Artifacts Type: Legendary Artifact Equipment Rarity: Mythic Cost: {4} At the beginning of combat on your turn, create a token that's a copy of equipped creature, except the token isn't legendary. That token gains haste. Equip {5}