Clockwork Avian [Antiquities] Human Advisor each other player sacrifices a

each other player sacrifices a creature

So I says to young Angus

Set: Legends Type: Artifact Rare Cost: {4} {2}

you may pay {1}

Clockwork Avian [Antiquities] Human Advisor each other player sacrifices aSet: Antiquities Type: Artifact Creature Bird 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.