In Kalos, the Myth Arc is based around the phenomenon of Mega Evolution, its origins and the characters who utilize it in the present day, and Team Flare desiring to use the energy of Mega Evolution and the Legendary Pokmon Zygarde to wipe out most of the world's population and preserve its "beauty"
A natural downside of decks that utilize big mana creatures is that if the ways to cheat around their mana cost aren't on the battlefield, the big spells will stay stuck in your hand
And as callbacks go, I like that Bolass ultimate made reference to his original card from Legends while also being built upon to make it more jaw-dropping
Permanents leave the battlefield when they are sacrificed, destroyed, exiled, or returned to hand (bounced)
Later releases tempered Claydol's abilities, and it never regained the same importance as those earlier years
Use this turtles trigger with cards like Loot, Exuberant Explorer or basic land fetch cards like Cultivate