Leaning in would mean playing some fun cards that have no other home, like Confusion in the Ranks, Forgeborn Oreads, and various other blue enchantments you like
This is almost definitely considered gambling and you might end up with nothing
The reason this line is slightly worse than the 2 Pikachu setup is that if your hand gets disrupted somehow (e.g., your opponent breaks the lock with an Escape Rope or similar, and then plays N), you now have 2 pieces you need to find from your deck (Raichu and the Devolution Spray)
A 1/2 goblin pirate that creates treasure tokens equal to the number of artifacts and enchantments your opponents control, which could easily provide an advantage for the rest of the game, all for just 2 mana
Wizards expanded on the mechanic in 2018s Battlebond with the less flexible Partner with on 22 additional cards, which only allowed players to partner specific legends together