The key here is that you can never tap a creature that’s already tapped, or untap a creature that’s already untapped. Attempting to do so to pay a cost is like attempting to pay 1 mana when you have no mana in your mana pool; you can’t do it.

Can you tap an artifact on another player’s turn?

Yes, you may.

When can you tap a creature with summoning sickness?

“Summoning Sickness” is a common phrase to describe a much wordier rule: A creature cannot attack or activate abilities with the Tap or Untap symbol unless it has been under your control continuously since the beginning of your most recent turn (unless it has haste).

What do you do when you tap an untapped creature?

Tap an untapped creature you control: Tap target artifact or creature. Destroy target artifact or enchantment. Conspire (As you cast this spell, you may tap two untapped creatures you control that share a color with it.

What do you get when you untap an artifact in magic?

Untap target artifact, creature, or land. Draw a card at the beginning of the next turn’s upkeep. When Janjeet Sentry enters the battlefield, you get (two energy counters). , Pay : You may tap or untap target artifact or creature. You may tap or untap target artifact, creature, or land.

How many untapped humans can you tap in Metalcraft?

, Tap two untapped Humans you control: Exile target artifact or enchantment. Tap target creature. Metalcraft — If you control three or more artifacts, exile that creature. Whenever Dross Scorpion or another artifact creature dies, you may untap target artifact. , : You may tap or untap target artifact, creature, or land.

What happens when you tap a target artifact?

Each artifact you tap after you’re done activating mana abilities pays for .) Target creature gets -X/-X until end of turn. You gain X life. Whenever another Zombie enters the battlefield under your control, you may tap target artifact or creature. : Add . , : Tap target noncreature artifact.