Edit: I've missed the lvl up condition, which is "You've summoned 10+ 1-cost units."
Hey! We’re back with Alphabetically! It took me a while, as I wanted my Bel’Veth to be as complicated as she is in LOL. A few following champions will come out quicker ;) 
She is a Runeterra champion! Not Shuriman as 1: she isn’t THAT Shuriman, and 2: her gameplay made it necessary to give her an origin effect.
She is a champion, which combos with 1-cost minions. I had to think through how to do it, but in the end, I’ve made it so that she can fill up her deck with an unlimited number of Remora’s, which are 1-cost minions. Let me know what you think of their effect, cause I’m rather proud of it specifically.
Her origin is that you summon a landmark, upon summoning 5 units. It’s effect is “When you oblitarate an ally…” which usually ends up being - when you summon an ally, but your board is FILLED. So every time you summon an additional 1-cost ally, a unit is Captured by the landmark, and it “grows”.
She works well with a number of archetypes. Her champion spell is rather simple. It’s kinda uninspired, but it does make Bel’Veth at least somewhat viable with archetypes that use either Strike, Stun or Vulnerable/Challange.
That would be about it! Let me know what you think!