Staff of Domination's second ability by paying ({2} magic symbol) and tapping it, causing you to gain 1 life.
Archangel of Thune and
Cryptic Trilobite trigger, putting two +1/+1 counters on
Cryptic Trilobite and one +1/+1 counter on each other creature you control.
Activate
Cryptic Trilobite by removing two +1/+1 counters from it, adding ({C} magic symbol) ({C} magic symbol) ({C} magic symbol) ({C} magic symbol) that can only be spent to activate abilities.
Activate
Staff of Domination's first ability by paying ({1} magic symbol) , untapping it.
Repeat.
Notes
Once you have infinite mana, you may use it to activate
Staff of Domination's other abilities.
Results
Infinite lifegain triggers.
Infinite lifegain.
Infinite card draw.
Infinite untap of creatures you control.
Infinite draw triggers.
Infinite mana creatures you control can produce.
Infinite +1/+1 counters.
Infinite colorless mana that can only be spent to activate abilities.