Enchantement — aura
Enchanter : un géant que vous contrôlez
Quand l'Emprise du géant arrive sur le champ de bataille, acquérez le contrôle d'un permanent non-terrain ciblé tant que l'Emprise du géant reste sur le champ de bataille.
If Giant's Grasp leaves the battlefield before its triggered ability resolves, you won't gain control of the target nonland permanent at all.
Gaining control of a nonland permanent doesn't cause you to gain control of any Auras or Equipment attached to it.
The control-changing effect doesn't expire if another player gains control of Giant's Grasp (although this is likely to cause it to leave the battlefield because it can enchant only a Giant controlled by the controller of Giant's Grasp). The effect expires only once Giant's Grasp is no longer on the battlefield.