The original prototype cards were put in the nameless Pharaoh's tomb as Pegasus realized the cards were too powerful and dangerous to be mass-produced and asked Ishizu Ishtar to bury the prototypes in the Pharaoh's tomb
Because pretty soon everyone is going to want to get seriously Squirrelly
Not as mechanically integral, but still cool, they all tell a story within their chapter abilities
Relinquished is hard to get rid of once it's on the field, allowing for control strategies to shine during Goat Format
Its attack, Syrup Storm, even capitalises on this ability beautifully, as it deals 30 HP of damage plus an extra 30 for each Grass Energy you have attached to all of your Pokemon
The key component to this is that Legolass Quick Reflexes has split second, making it so long as it is on the stack, no one can cast spells or active abilities in response unless that ability produces mana