Mina and Denn, Wildborn, Azusa, Lost but Seeking, and Aesi, Tyrant of Gyre Strait each allow you to do this
The thing I like about manifest flavorfully is that it is magic that hints at what morph will one day become without exactly being morph
Considering you're already running a bunch more artifacts between ramp purposes and other Equipment you obviously want to include in your Equipment-themed deck, and you've got yourself a pretty heavy-hitting creature
Graveyard hate also disrupts flashback, escape, and Underworld Breach lines
Fifth Dawn had three!) But I had forgotten to take one thing into account: the Rules Manager
Naturally, putting multiple more powerful dragons into play is well worth it if you can pull it off in Commander as well, but I generally only see 2-3 come out when most decks cast Dragonstorm