Clockwork Avian [Antiquities] Juggernaut Thief of Blood enters the

Thief of Blood enters the battlefield with a +1/+1 counter on it for each counter removed this way

(It's an artifact with "{T}

Gruul raider

Set: Shadows over Innistrad Prerelease Promos Type: Legendary Artifact Rarity: Rare Cost: {5} At the beginning of your upkeep

Set: Dragons of Tarkir Type: Legendary Creature — Elder Dragon Rarity: Mythic Cost: {4}{B}{R} Flying

Clockwork Avian [Antiquities] Juggernaut Thief of Blood enters theSet: 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.