I got several notes both in favor and against the "cuteness" of tying many of the mechanics to the number seven for the sake of the game's title
Additionally, any monsters an opponent summons automatically loses 2,000 Attack points, and if the number then reaches 0, it gets destroyed
Virtue of Persistence is easily the next-best in the cycle, and Restless Fortress has synergy with both Poisoner and Virtue
they were only returned to the other player's Deck, either player's Extra Deck, or were Token Monsters), then that player does not need to shuffle their Deck
But none are as horrifying (or as wiggly) as the Lovecraftian eldrazi creatures
Arguably, the most famous printing of Rayquaza is Rayquaza VMAX, and its highest rarity printing is over $700 for a near-mint copy of the card