Clockwork Avian [Antiquities] Jace Enchanted Wall can attack as

Enchanted Wall can attack as though it didn't have defender

1 — Sacrifice Jack-in-the-Mox and you lose 5 life

Set: Kaladesh Inventions Type: Artifact Rarity: Mythic Cost: {3} You may choose not to untap Vedalken Shackles during your untap step

Set: Magic Player Rewards 2007 Type: Instant Rarity: Rare Cost: {1}{W} Destroy target artifact or enchantment

Clockwork Avian [Antiquities] Jace Enchanted Wall can attack asSet: 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 only during your upkeep.