({4} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) ({R} magic symbol) plus enough mana to pay for commander tax, if applicable available.
Steps
Activate
Memnarch's first ability by paying ({1} magic symbol) ({U} magic symbol) ({U} magic symbol) , causing
Sphinx's Disciple to become an artifact.
Cast
Idris either from your hand or from the command zone by paying ({1} magic symbol) ({U} magic symbol) ({R} magic symbol) and commander tax, if applicable.
When
Idris enters the battlefield, its imprint ability triggers, targeting
Sphinx's Disciple.
Holding priority, activate
Strionic Resonator by paying ({2} magic symbol) and tapping it, copying
Idris' trigger, targeting
Basalt Monolith.
Resolve both
Idris triggers, exiling
Basalt Monolith and
Sphinx's Disciple.
During your next turn, activate
Idris using
Basalt Monolith's first ability by tapping it, adding ({C} magic symbol) ({C} magic symbol) ({C} magic symbol) .
Activate
Idris using
Basalt Monolith's second ability by paying ({3} magic symbol) , untapping it.
Sphinx's Disciple triggers, causing you to draw a card.