That's not that unique of an attribute, but he can also gain two lore every time he challenges , making for an aggressive one-two punch the moment he's played
For example, if Clive's Hideaway's hideaway ability is copied and two cards are exiled, you may cast both exiled cards without paying their mana costs (assuming you control four or more legendary creatures at that time.) Gogo's ability can copy any activated or triggered ability on the stack, not just one with targets
All the legends in these decks have a unified goal of working together within their decks theme and its fun building cards like this to have that creative team synergy, whether thats sayinteracting with counters in Final Fantasy X or playing with the graveyard in Final Fantasy VI
A Whole New World, when timed correctly can refill your hand and force your opponent to discard cards that they probably want to use, cycling through their deck quicker, a staple card in Mill decks