Morselhorder has at least one -1/-1 counter on it.
Steps
Activate Morselhorder by removing all -1/-1 counters from it, adding ({B} magic symbol) for each counter removed.
Activate Wandering Mage's third ability by paying ({B} magic symbol) and putting two -1/-1 counters on Morselhorder, preventing the next two damage dealt to you this turn.
Repeat.
Results
Infinite colored mana.
Prevent all damage that would be dealt to you and creatures you control.