In your hand, you need Dockside Extortionist and another creature, as cheap as you can get
The second line is best for Merfolk, but there are 15 Cephalids in Magic , too
And nobody likes to see a Cyclonic Rift resolve
I've also focused on cheap protection for Cloud like Loran's Escape, and something that nobody really talks about is Green's "draw cards equal to power" which is bananas here like Hunter's Insight which is easily a 3 mana draw 7+, I find it kinda silly that all the precon guides are focusing on more expensive and less efficient draw options like Sram, Senior Edificer or even Sword of Fire and Ice when you can just out-value all of that with cards that are less than a dollar
Either you cheat out the Jar for minor cost or you just wait on cracking it until you untap and have loads of mana for your new hand of cards
(2021-09-24) A spell cast using flashback will always be exiled afterward, whether it resolves, is countered, or leaves the stack in some other way