Clockwork Avian [Antiquities] Archenemy Schemes and that player can't activate

and that player can't activate abilities that aren't mana abilities

Set: Kaladesh Prerelease Promos Type: Enchantment Rarity: Rare Cost: {W} Creatures your opponents control enter the battlefield tapped

Enchantment (5)

each containing 15 MTG cards

Artifact (7)

Clockwork Avian [Antiquities] Archenemy Schemes and that player can't activateSet: 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.