Clockwork Avian [Antiquities] Xyz/Effect monster you can Special Summon that

you can Special Summon that monster to your side of the field in face-up Defense Position

Set: Black & White: Dark Explorers Type: Fire Rarity: Holo Rare Retreat cost: Colorless

when your opponent would Special Summon a monster: You can send this face-up card to the Graveyard

destroy this card at the end of the Damage Step

Clockwork Avian [Antiquities] Xyz/Effect monster you can Special Summon thatSet: Antiquities Type: Artifact Creature Bird Rarity: Rare Cost: {5} Flying Clockwork Avian enters the battlefield with four +1 +0 counters on it. At end of combat, if Clockwork Avian attacked or blocked this combat, remove a +1 +0 counter from it. {X}, {T}: Put up to X +1 +0 counters on Clockwork Avian. This ability can't cause the total number of +1 +0 counters on Clockwork Avian to be greater than four. Activate this ability only during your upkeep.