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Beguiler of Wills

{T}: Gain control of target creature with power less than or equal to the number of creatures you control.

Rarity : Mythic
Types : Creature
SubTypes : Human, Wizard
Artist : Eric Deschamps
Flavor : "Come, let me free you of the tyranny of thought."
Cost converted to mana : 5

Rulings

22 January 2011
In order to activate the ability, you must be able to target a creature with power less than or equal to the number of creatures you control. The comparison is made again when the ability resolves. If the power is greater than the number of creatures you control at that time, the target is illegal and the ability doesn’t resolve.
22 January 2011
The control-changing effect lasts indefinitely, even if the power of the creature becomes greater than the number of creatures you control after the ability resolves.

Elbrus, the Binding Blade

Equipped creature gets +1/+0. When equipped creature deals combat damage to a player, unattach Elbrus, the Binding Blade, then transform it. Equip {1}

Forge Devil

When Forge Devil enters the battlefield, it deals 1 damage to target creature and 1 damage to you.