"You" and "your" in card text refers to the player. For example, cares about "spells you've cast," which includes any spells from any of your spellcasters. As another example, would trigger if you used your Avatar's ability or if you used .
Some older cards use the word "you" to mean "your avatar." If it's impossible to read the card as "player" in a sensible way, then use "avatar" instead. For example, follows your avatar and looks at her own adjacent sites.