A garlicky, citrus-spiked marinade makes this steak something special.
In a large bowl, whisk the garlic, cilantro, orange juice, oil, chili powder, cumin, salt, and pepper. Add the steak. Turn until coated. Cover and chill, turning often, for 4 hours.
Heat a grill to medium-high. Grill the steak until charred in spots, about 4 minutes per side for medium-rare. (If it chars too quickly, move the steak to a cooler part of the grill.) Transfer to a cutting board. Let rest for 10 minutes. Slice the steak thinly against the grain. Serve with the salsa and tortillas.