Yes, there is no restriction in the rules that prevents a player from paying the costs of an activated ability twice, to get the effect twice. An Activated Ability is the only ability that can be activated. You may activate it whenever, and as many times as you like, as long as you have priority by paying the cost.
Can you activate creature abilities during upkeep?
Yes, you can activate abilities and cast instants during your upkeep.
Do creature Mana abilities use the stack?
Mana abilities don’t use the stack. A mana ability is an activated ability that adds mana to your mana pool. (There are rare exceptions to this, but let’s ignore them for now.) So, for example, tapping lands or Llanowar Elves for mana can’t be responded to and doesn’t use the stack.
When does activating an ability put it on the stack?
Rule 112 covers this adequately. Rule 112.3a tells us that Activating an ability puts it on the stack, until it resolves, is countered ( Stifle ), or it otherwise leaves the stack ( Time Stop ).
Can a creature be tapped to prevent its activated ability?
Only after you are done activating your creature’s ability does your opponent has a chance to play his tapping ability, but by that point your creature is already tapped, and tapping it won’t have any effect. If you do not have priority, then your opponent may choose to activate his tapping ability to tap your creature.
How does an activated ability work in magic?
If an activated ability is being activated from a hidden zone, the card that has that ability is revealed. That ability is created on the stack as an object that’s not a card. It becomes the topmost object on the stack. It has the text of the ability that created it, and no other characteristics.
What to look for in an activated ability?
For reference, an activated ability uses the template COST: Effect. Look for the colon. A triggered ability generally starts with “At,” “When,” or “Whenever.” It is also important to note that once an ability is on the stack, it will happen.
