OK, taking that frame of mind into account, does it make sense to replace the Curious Obsessions with Rescue? The Dive Down cards do their job and save a dragon from removal for a turn but with the Sarkhan's Unsealing would it make sense to snap a dragon back just before your turn to recast it?
You don't want to have to recast your dragons, you want to cast the new dragons you just drew.
If you really, really want to protect your dragons from removal and reap the etb of the unsealing, then I'd suggest you try
siren's ruse, that way you won't need to recast them.
But blink effects like that are for decks packed with etb value and I don't think that's case with dragon decks.