Against decks with sweepers, allocating counters onto your Mutavaults is generally a good idea
Whether you pulled it from a pack in a moment of pure adrenaline, tracked it down as a single purchase to cap off your Crown Zenith binder, or had it graded and displayed as the centerpiece of your modern collection, Pikachu VMAX is the defining card of Crown Zenith and one of the signature cards of the Sword and Shield generation
Winged Boots Granting ward 4 reasonably easily is really nice
The end of the turn proper is the cleanup step
Sejiri Shelter is exactly what the deck wants, and Kazuuls Fury is a way to convert one huge creature into an additional damage source
In general I also find shinies overrated - perhaps this should go into the unpopular opinions thread - so sets like Hidden/Shining Fates, Call of Legends, secret rare reverse holos in DPP and Shining Legends arent really that interesting for me