A sacrificed permanent must be something you control, you cannot sacrifice your opponent's cards. Vivisection's additional cost has to be a creature you control.
Sometimes your cards can force the opponent sacrifice his permanents. These all clearly say the card is making the opponent, not you, sacrifice them.
In Magic: The Gathering, "annihilator" forces opponents to sacrifice permanents when a creature with this ability attacks, while "hexproof" makes a creature immune to being targeted by spells or abilities controlled by opponents.
Yes, in a game of Magic: The Gathering, you can sacrifice an opponent's creature if a card or ability allows you to do so.
In Magic: The Gathering (MTG), "sacrifice" means intentionally getting rid of a permanent, like a creature, as a cost for a spell or ability. This is different from a creature dying, which usually happens as a result of combat or damage. Sacrificing a creature is a deliberate action, while a creature dying is often a consequence of gameplay.
Attaching MTG Cranial Plating to a creature means physically connecting the card to the creature, while equipping it means activating its ability to attach to a creature you control.
'Mindslaver' is one.
No, an artifact is not considered a creature type in Magic: The Gathering.
No, you cannot tap a creature with summoning sickness in Magic: The Gathering.
Yes, creature tokens are considered creatures in Magic: The Gathering.
No, creatures do not tap when they block.
In Magic: The Gathering, a maximum of one enchantment can be attached to a creature at a time.
Yes, in a game of Magic: The Gathering, you have to tap a creature to use it to block an attacking creature.
No, in Magic: The Gathering, one creature can only block one attacker at a time.