Treachery [Urza's Destiny] Oathbreaker if Clockwork Avian attacked or

if Clockwork Avian attacked or blocked this combat

Set: Beta Edition Type: Basic Land — Plains Rarity: Common ({T}: Add {W}

Set: Portal Three Kingdoms Type: Legendary Creature — Human Soldier Rarity: Rare Cost: {2}{U}{U} Horsemanship (This creature can't be blocked except by creatures with horsemanship

Set: Kaladesh Inventions Type: Artifact Creature — Construct Rarity: Mythic Cost: {3}{G}{G} Trample

Bronze Bombshell deals 7 damage to the player

Treachery [Urza's Destiny] Oathbreaker if Clockwork Avian attacked orSet: Urza's Destiny Type: Enchantment Aura Rarity: Rare Cost: {3}{U}{U} Enchant creature When Treachery enters the battlefield, untap up to five lands. You control enchanted creature. "The academy educates; I employ. It's a perfect arrangement." Gatha, Tolarian renegade