Volrath, the Shapestealer | Great Whale | Myr Propagator (and one other card)

Cards

Myr Propagator and
Great Whale have at least one counter on them.
Lightning Greaves attached to
Volrath.
You control up to seven lands that can tap to produce at least ({6} magic symbol) .

Activate up to seven lands you control by tapping them, adding at least ({6} magic symbol) .
Activate
Volrath by paying ({1} magic symbol) , causing it to become a copy of
Myr Propagator until end of turn.
Activate
Volrath by paying ({3} magic symbol) and tapping it.
Holding priority, activate
Volrath by paying ({1} magic symbol) , causing it to become a copy of
Great Whale until end of turn.
Resolve the
Volrath ability from step 3, creating a token copy of it that is a copy of
Great Whale.
The
Volrath token enters the battlefield, untapping the seven lands.
Activate
Lightning Greaves' equip ability by paying ({0} magic symbol) , attaching it to the
Volrath token.
Repeat.

This combo has been estimated to be Exhibition (Bracket 1+).