Tapping a card with an effect like this will never pay the cost of an ability. For example, tapping a land with this card will not put a point of mana into a player's pool. And tapping a Prodigal Sorcerer will not make them have to deal a point of damage to something. [D'Angelo 1998/02/03]
This card's ability is played on the stack. That means that any instants or abilities announced in response to it will resolve first. Also, any card which is tapped as a cost will be tapped before this resolves. What this means is that the Icy Manipulator cannot be used to stop someone from using an ability of the permanent you plan to tap. [D'Angelo 1998/06/03] It can be used to make a player use the ability now or to not use it. For example, you can use the Icy on your opponent's Prodigal Sorcerer and force them to use it or let it get tapped. Then you can play a 6/1 Ball Lightning, knowing the creature will at least live long enough to damage your opponent.
If you want to stop someone from attacking with a creature by using this card, you must do so before attackers are declared. You cannot wait until after attackers are declared and then try to use it to make a creature stop attacking. [D'Angelo 1998/06/03] Note that your opponent cannot start declaring attackers without letting you use the Icy.
Tapping an attacking creature which did not tap to attack does not remove the creature from the attack or cause the creature to stop dealing damage. [D'Angelo 1998/06/03]
Any cards which might trigger off a card becoming tapped will trigger. Thus, a Psychic Venom on a land that becomes tapped will cause 2 damage. [D'Angelo 1995/03/12]
Can target a tapped card, but tapping a tapped card does nothing useful. [Duelist Magazine #5, Page 23] And it will not trigger "if the card becomes tapped" effects.
Vintage tournaments (see Rule 801) restricted this card from 1994/01/25 to 1994/03/23.
Décima Edição
(Uncommon)