Play the shapeshifter, use it to discard progenitus from your hand and presto you have a progenitus copy with only 3 mana!
I added the stronghold so you can bring the progenitus back to the top of your graveyard if it gets another creature on top of it. You could leave this out and run a mono blue deck with progenitus.
Get Draco in your graveyard then put him on your library come draw time and pyromancy blows him up.
Er, 16 damage... was originally adding pyromancer's swath to put hand in graveyard but realized Pyromancy wasn't an instant or sorcery so I went with buried alive to tutor your ammo right away.