Note that this effect is also applied to yourself, so if you don't prepare a link destination, you will be pulling your own legs
If a permanent's activated ability is on the stack when that permanent is detained, the ability will be unaffected
It's a soft once per turn effect, meaning multiple copies can negate multiple Spell cards
Then, if that player controls a creature with a power of ten or greater, they gain ten life
Enterprise-D, Galaxy-Class Crystalline Entity Watery Grave Temple Garden Stomping Ground Steam Vents Sacred Foundry Overgrown Tomb Hallowed Fountain Godless Shrine Breeding Pool Blood Crypt
However, as far as we can tell, it's loved by many