Activate Anzrag by paying ({3} magic symbol) ({R} magic symbol) ({R} magic symbol) ({G} magic symbol) ({G} magic symbol) , causing opponents to block Anzrag if able this turn.
Cast Fog by paying ({G} magic symbol) , preventing all combat damage that would be dealt this turn.
Declare Anzrag as an attacker, attacking an opponent who controls a creature.
The opponent is forced to block Anzrag, triggering Anzrag, untapping all creatures you control and causing you to get an additional combat phase after this one.
Any combat damage that would be dealt is prevented due to Fog.