Ravenous Robots I award Ravenous Robots bonus points for creating a lot of tokens, and the power of haste on tokens cannot be understated
As is typically the case with each new Magic: The Gathering set, it can take some time for card prices to settle
And we do have a precedent for a recent run of Commander decks increasing in price several years after release: Commander 2014
While Wizards owns a lot of the IP on Magic cards (the art, mana symbols, etc.) there is t nothing illegal about a piece of cardboard the same size of a Magic card with some unique custom art that might look a bit like a Mox, an Underground Sea, or a Wheel of Fortune
The other option is to take advantage of the direct damage, which is good in its own right to either finish off a damaged character or get them within range to be banished but also works with the likes of cards that benefit from being damaged - such as Scroop, Backstabber - that benefit from healing damage, like Rapunzel, Gifted Artist, or from damage being dealt: like Beast, Relentless.