Flip walkers are handy, since the "may" clause in his trigger means you have a bit more control over when you actually want him to be a Planeswalker, and having a force multiplier and way to defend himself built is a really great touch
Meanwhile Red has access to a lot of targeted artifact hate - Manic Vandal, Ingot Chewer, and Oxidda Scrapmelter - and White has primarily access to the enchantment hate - Dawnbringer Cleric, War Priest of Thune, Wispmare
There are drawbacks to Hypergenesis as well, like needing to fill your deck with super-expensive cards that you aren't going to be able to cast fairly if your opponent can shut down your plan of cascading into Hypergenesis, which is a real risk in a format where Teferi, Time Raveler, Chalice of the Void, and Force of Negation are among the most played cards in the format
Icewrought Sentry's last ability will trigger only when an effect instructs you to tap an opponent's creature
Anointed Procession Roaming Throne Mondrak, Glory Dominus Ocelot Pride That covers our run-through of the options for putting an Arna Kennerd, Skycaptain deck together
Whether the resulting coin flip results in an upset or not, someone is probably getting a great story out of the play
