Loki in his astral form, which as sadly been lacking in recent titles (does Loki manipulating Osborn count?).
Loki can use his astral form to do many things, such as lounging, mocking, manipulating, and semi-escaping imprisonment (he can leave in astral form and, even though he is MUCH less powerful in his astral form, still wreak havoc). He can also – wait for it – stalk Thor!
And yes, that last panel is a relatively weak astral form Loki in the process of defeating Doctor Strange.