Add the meat to a gallon sized zip lock baggie, along with the fresh lime juice, garlic, powder, pepper, oregano, and salt.
Zip shut and mash everything around until the ingredients are evenly dispersed. Marinate at least 1 hour, or up to 5 hours for stronger flavor.
Grill the steak over medium heat to desired preference. I like to get mine to an internal temperature of 155-160F, which is about medium. The cooking time will vary depending on how thick your steak is.