Ajani Vengeant

[+1]: Target permanent doesn't untap during its controller's next untap step.
[−2]: Ajani deals 3 damage to any target and you gain 3 life.
[−7]: Destroy all lands target player controls.

Magic Online Promos

Duel Decks: Ajani vs. Nicol Bolas

+1: Target permanent doesn't untap during its controller's next untap step.
-2: Ajani Vengeant deals 3 damage to target creature or player and you gain 3 life.
-7: Destroy all lands target player controls.

Shards of Alara Promos

Shards of Alara

The first ability tracks the permanent, but not its controller. If the permanent changes controllers before its first controller's next untap step has come around, then it won't untap during its new controller's next untap step.

You may target any permanent with Ajani Vengeant's first ability. It doesn't have to be tapped.