Yu-Gi-Oh! 5D's Stardust Accelerator promotional cards

When you draw this card, if you have no other cards in your hand: You can reveal this card; Special Summon this card from your hand. When this card is Special Summoned: You can add 1 "Infernity" card from your Deck to your hand. You must have no cards in your hand to activate and to resolve this effect.

Infernity Archfiend

While you have no cards in your hand, if a monster you control attacks a Defense Position monster, inflict piercing battle damage to your opponent.

Infernity Dwarf

While you have no cards in your hand, this face-up card cannot be destroyed by battle or by card effects.