Mythical Beast Master Cerberus [EXFO-EN027] Secret Rare BT6-065 You can only use this

You can only use this effect of "Guardragon Elpy" once per turn

[Piercing] (When this Digimon attacks and deletes an opponent's Digimon and survives the battle

5 Promos Card type: Digimon Rarity: Uncommon Digi type: Beast Play Cost: 5 Form: Champion Attribute: Vaccine Digivolve Cost: 2 Digivolve Cost Level: 3 [Security] At the end of the battle

or 1 Spell/Trap that specifically lists the card "Ancient Gear Golem" in its text

Mythical Beast Master Cerberus [EXFO-EN027] Secret Rare BT6-065 You can only use thisSet: Extreme Force Card type: Pendulum Effect Monster Rarity: Secret Rare Attack: 2800 Defense: 2800 Each time a Spell Card is activated, place 2 Spell Counters on this card when that Spell resolves. Cannot be destroyed by card effects while 4 or more Spell Counters are on your field. Once per turn: You can remove 4 Spell Counters from your field, then target 1 monster your opponent controls; banish it face up, and if you do, this card gains ATK equal