I cant pretend gaining life is all that impressive, but cycling through lands and keeping the cat in play are worth investing mana into, especially if those lands find their way back to the battlefield
These are: Traveling Chocobo (Black) - Borderless, Japanese exclusive: cheapest listing for $7,500 on TCGPlayer, $12,120 average listing Cloud, Midgar Mercenary - Pro Tour Promo: cheapest listing for $800 on TCGPlayer, $3,775 average listing MTG's Most Expensive Modern Cards Explained Although they are both very rare, these are not "unique" cards, in the sense that multiple copies were printed very recently, and they are in someone's possession
Fundamentally, I'm not sure that Eiganjo has an easy home right now, but it's a powerful enough spell/land that it's worth keeping in mind, and it will probably show up in Modern at some point
Ditto: Detective Pikachu (Holo Rare) $3.82 A Beloved Blob Ditto doesn't jump to your mind when you think about valuable promo cards, but this Holo Rare is one of the best Detective Pikachu cards and boasts a solid value to go with it
Even if you ignore all of the political advantages discussed above, selective group hug effects play very differently from universal group hug effects