Look at Canoptek Scarab Swarm for a similar version that synergizes with a different subset of decks
The trick is pairing this with Badgermole Cub, which allows you to Earthbend a land to sacrifice, resulting in a net gain of four lands and five landfall triggers in a single turn
This excellent flip land eliminates your maximum hand size until the end of the game, but its especially useful when Sea Gate, Reborn saves you from being mana-locked early on
If you want to go the extra mile, run Keruga as a companion and see how well you do with your mana curve pushed up just a bit
It seems innovative enough, but the difficulty of tracking which doors are unlocked can be a headache (Strike three!), given other things that we need to track on the battlefield
A new instance of Valki won't have access to the creatures another instance of Valki exiled, so that's going to complicate any plans we have to use both sides of this card at the same time