If trading individual cards, trade-in for cards that can go in multiple decks : This is similar to the reason for rare and mythic dual lands
While the tokens are exiled at the beginning of the next end step, they can be used for pushing damage through to an opponent or even creating blockers when casting spells at instant speed
When two cards are exiled and melded, they each leave the battlefield, then return together as one new untapped object with no relation to either of the objects that left the battlefield
His soldiers etch his words on the insides of their shields, their inspiration always in sight during battle
Gogos base ability is already on par with cards like Strionic Resonator, and its scalable, so you pay 2 mana for one copy, 4 mana for two copies, and so on