Magewright's Stone
Artifact
, 
: Untap target creature that has an activated ability with in its cost.
The stones hark back to an age before civilization, when the living earth blessed all who trod its untamed wilds.
Carl Critchlow
Dissension (DIS)
• #162Rulings
This looks for the {T} symbol. The phrase “tap an untapped creature you control” isn’t the same and doesn’t count.
(wotc • 2006-05-01)
If an activated ability with {T} in its cost is granted to a creature by an effect (such as Hypervolt Grasp’s effect, for instance), Magewright’s Stone can untap that creature.
(wotc • 2006-05-01)
Rulings
This looks for the {T} symbol. The phrase “tap an untapped creature you control” isn’t the same and doesn’t count.
(wotc • 2006-05-01)
If an activated ability with {T} in its cost is granted to a creature by an effect (such as Hypervolt Grasp’s effect, for instance), Magewright’s Stone can untap that creature.
(wotc • 2006-05-01)