Obeying all of the laws of physics, magic wouldn’t work at all. Assuming you were able to break a few but kept some such as conservation of energy, it would be very powerful, ex: teleportation does not break conservation of energy as long as you teleport to the same height you left from. If you were able to extract energy from your surroundings, you could probably do basically anything you want. You could lower the sun’s heat by a degree and be able to move a mountain.