As for Shadow itself, card draw is nice but the real draw here is the fact you can repeatedly drain each opponent of life whenever you trigger this ability
But for the Un sets we have an open door policy for any R&D members who want to contribute an idea
Wizards clearly stated back in 2016 that it has no desire to police proxies, even for in-store play, as long as the events aren't sanctioned and the events are using traditional proxies and not counterfeit cards
Creature - Human Soldier Ranger Relic Seeker Renown 1 (When this creature deals combat damage to a player, if it isn't renowned, put a +1/+1 counter on it and it becomes renowned.) When this creature becomes renowned, you may search your library for an Equipment card, reveal it, put it into your hand, then shuffle
Obeka seems to be more about setting up the big turn, getting value along the way, the big turn being a big swing with Obeka
Thats an outrageous bit of value attached to one of your characters and it also protects you against the classic one-two punch of the meta defining ruby-amethyst control deck of set two, which would wipe your board with Be Prepared and then answer the first character you play with a Lady Tremaine which would force you to sacrifice it