MTG lore: Nicol Bolas is an elder dragon whose schemes span dimensions all for the purpose of gaining power. Through much manipulation and sheer force of will, he practically became a god, before succumbing to his own hubris and being trapped by his brother for eternity.
Yugioh lore: so there's this kid named Shark
@Griever is the kid named Shark trapped in the dolphin dimension
i don't actually know shit about bolas or mtg lore