From gaining a set of support for the Ninjitsu Arts, specifically Ninja Grandmaster Hanzo, to gaining support for Synchro Summoning, specifically through the Karakuri Ninjas, and subsequently Xyz Summoning, through the Armor Ninjas combined with Upstart Golden Ninja, the theme has seen evolution over the course of the history of the TCG like no other
One of them was a Temporal Forces Booster, and the other was an Obsidian Flames Booster Pack
Over time, this can turn Palantir of Orthanc into a substantial threat, which almost guarantees the draw effect
I'm stealing a bit of a take from MTGGoldfish's Saffronolive, but I think if she additionally gave YOU hexproof she could be really interesting
While its not tournament-defining, its pure fun (EXs everywhere, flashy pulls in every pack, and an over-the-top vibe that still feels unique)