Clockwork Beast [Unlimited Edition] Magic 2015 Clash Pack The Battle of Tomakul taught

The Battle of Tomakul taught Urza not to rely on fickle reinforcements

the controller of the permanent it becomes sacrifices it at the beginning of the next cleanup step

The generals were dead

then discards three cards

{T}: Gain control of target legendary creature for as long as you control Willow Satyr and Willow Satyr remains tapped

Clockwork Beast [Unlimited Edition] Magic 2015 Clash Pack The Battle of Tomakul taughtSet: Unlimited Edition Type: Artifact Creature Beast Rarity: Rare Cost: {6} Clockwork Beast enters the battlefield with seven +1 +0 counters on it. At end of combat, if Clockwork Beast attacked or blocked this combat, remove a +1 +0 counter from it. {X}, {T}: Put up to X +1 +0 counters on Clockwork Beast. This ability can't cause the total number of +1 +0 counters on Clockwork Beast to be greater than seven. Activate only during your upkeep.