Steelswarm Cell (HA05-EN043) - Hidden Arsenal 5: Steelswarm Invasion Unlimited

If you control no monster, you can Special Summon this card (from your hand). While this card is face-up on the field, it cannot be Tributed, except for the Tribute Summon of a "Steelswarm" monster, and cannot be used as a Synchro Material Monster.