Did I miss any important ones
310.8d If a battles protector is a different player than its controller, all rules and effects that refer to the defending player relative to a battle that is being attacked refer to that battles protector rather than its controller
On the other end, the more challenging sieges, like Invasion of Arcavios and Invasion of Alara, enter with seven counters
A GW hatebears deck actually won the most recent Bazaar of Moxen Modern event (307 players), and this would fit perfectly into a deck like that
It gains "When this creature dies or is put into exile, return it to its owner's hand and create a 1/1 white Spirit creature token with flying." 3: Exile target nonland permanent
Alternatively, the Saga Creatures we see could all be as conservatively-designed as Shiva