Silvanus's Invoker and Nykthos on the battlefield.
You have at least eleven devotion to any color.
({2} magic symbol) available.
Steps
Activate Nykthos' second ability by paying ({2} magic symbol) and tapping it, causing you to add eleven mana of any color with which you have devotion.
Activate Silvanus's Invoker by paying ({8} magic symbol) , causing Nykthos to become an 8/8 Elemental with haste until end of turn, and untapping it.