Activate Mairsil using Gilded Lotus' ability by tapping it, adding ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) .
Activate Mairsil using Horseshoe Crab's ability by paying ({U} magic symbol) , untapping it.
Activate Mairsil using Quicksilver Elemental's ability by paying ({U} magic symbol) , causing it to gain all activated abilities of itself until end of turn.
Repeat.
If desired, you may use any of Staff of Domination's other abilities using Mairsil, and then use Quicksilver Elemental's ability to use them infinitely.