Dreamstone Hedron does not have summoning sickness.
({1} magic symbol) available.
Steps
Activate Toymaker by paying ({1} magic symbol) , tapping it and discarding a card, causing Dreamstone Hedron to become an artifact creature until end of turn.
Activate Dreamstone Hedron's first ability by tapping it, adding ({C} magic symbol) ({C} magic symbol) ({C} magic symbol) .