There are 10 Wild Artefacts in total. They are one of the key elements to progress in the game, to explore the world and to obtain various trophies & achievements. You won't get far if you don't know where to find them. You will need to learn Moogle Hunt and Moogle Throw first. Both abilities are obtained very early in the game. Moogle Hunt when going for Artefact #1 in Bresha Ruins 005AF and Moogle Throw when riding the big monster in Sunleth Waterscape 300AF for the first time.