While your initial reaction might not be wow, thats amazing, you can use this on opposing permanents too, like Planeswalkers, for example
Artifact Color tag templates(None) Mesmeric Orb Whenever a permanent becomes untapped, that permanent's controller mills a card
Repartee Whenever you cast an instant or sorcery spell that targets a creature, exile up to one target creature
Artifact Color tag templates(None) Minn, Wily Illusionist Whenever you draw your second card each turn, create a 1/1 blue Illusion creature token with "This token gets +1/+0 for each other Illusion you control." Whenever an Illusion you control dies, you may put a permanent card with mana value less than or equal to that creature's power from your hand onto the battlefield
Urzas Incubator If you land an Ugin's Labyrinth correctly, you could drop an Oblivion Sower on turn 3 with Urza's Incubator on turn 2
Ambrosia Whiteheart fits well in a White Weenie/Flicker deck in Magic: the Gathering, providing utility through returning a permanent and benefiting from landfall triggers for potential buffs
