While Kuldotha Rebirth isnt currently a staple in Modern, it has seen some play in the past, mostly in very aggressive 8 Whack style decks where adding three Goblin bodies to the battlefield for one mana is super valuable, but this might change now that we can play eight Kuldotha Rebirths in our decks
I remember who I traded for it
Team Rocket's Murkrow 200/182 Loading
Ting-Lu ex might take more effort to set up than most control decks, but it is still a viable option in specific situations
Commander already gives players an extra card in their "hand" by having a castable commander in the command zone, so having two commanders in a command zone further exacerbates this problem for anyone else at the table
If you want something new to run, you can always try your hand with either Vren, the Relentless, Xanathar, Guild Kingpin, and Etrata, Deadly Fugitive at the helm of your deck