Clockwork Avian [Fourth Edition] SM152 if your monster attacks a

if your monster attacks a Defense Position monster

Set: Battle Pack 2: War of the Giants Card type: Effect Monster Rarity: Rare Attack: 1500 Defense: 1600 After damage calculation

Set: Fusion Enforcers Card type: Quick Play Spell Rarity: Secret Rare Tribute 1 "Invoked" monster

Chupacabra

Set: XY: Roaring Skies Type: Dragon Rarity: Holo Rare Retreat cost: 4

Clockwork Avian [Fourth Edition] SM152 if your monster attacks aSet: Fourth Edition 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 only during your upkeep.