If you get three tails, your Lucky Punch is destroyed
According to the lore text at the bottom of the card, the creatures are trapped on a rock (possibly an asteroid.) Someone left behind an encrypted log recording the existence of slivers, either an unlucky explorer or, perhaps, a scientist involved in experimenting with the creatures, which would be a nice callback to the Riptide Project
Arceus set Shinx is one of my avatar shinies too and I really like Ponyta (Although the art could be better in my opinion) and Bagon too
While that would have been cute for a regular EX, its extremely risky for a Mega Evolution, losing which instantly ends the game with you on the losing side
Mana of any type can be spent to activate Sharkey's abilities
Sacrifice after III.) I Gain control of target creature for as long as this Saga remains on the battlefield