Aerion, The Bright Prince

When Aerion, The Bright Prince enters the battlefield, search your library for target artifact Wildfire Jar and put it onto the battlefield
tapped, then transform Aerion, The Bright Prince.
Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It cannot block
as long as it has a +1/+1 counter.)
"The dreams drove him so mad he thought drinking wildfire would turn him into a dragon."