UPDATE: After watching the initial theorycraft streams it's clear Pog-hopper suffers in the early/midgame and not with shuffling so I've added some nice early game control with Sunreaver Warmage (since we'll likely have Vanish & Sprint in hand) as well as some sticky taunts like Proud Defender.
Rise of Shadows, Theorycraft
NEW SHUFFLE SYNERGY
EXTREME DECK SHUFFLING & DRAW
Which could be done before Togwaggle's Scheme to ensure a concentrated pool of Pog-Hoppers
The deck winrate is ~4% better on HSReplay comparing it with and without Spirit of the Shark, so it might be more of a 'win more card' in situations where you're ahead. Definitely a fun card and somthing worth considering if the meta is more control orientated. Spirit of the Shark is competing with a Vanish or control/removal play on turn 6. Ideally with Spirit of the Shark you'd want to drop it turn 6 into a Pogo-Hopper and Barista Lynchen turn 7. Pogo-hopper decks tend to suffer from control, draw & surviving, so I'd be worried Spirit of the Sharkis too much of a tempo loss here.
Baleful Banker is also fantastic combo'd with Barista Lynchen but Pogo decks tend to suffer with draw not shuffling, and we've got a tonne more shuffle with the new cards. He tends not to appear in more recent Pogo lists.
Serrated Tooth doesn't see play in current Pogo decks but it might be a nice 1-drop for mulligan that will allow for nice pogo/removal plays in later turns
MORE RISE OF SHADOWS THEORYCRAFTS