As of now, though, the most expensive Doctor Who card is this, at $1500
But the real reason you run this is because he's a Shift target for the Floodborn Cheshire Cat and his value mainly depends on how good that Cheshire Cat is
casting a second spell to trigger Rammas Echor, making a token to trigger Tocasias Welcome
It is printed into the finest black core card stock using state of the art printing technology
While I hate the idea that some really sweet, old cards will essentially be lost to the sands of time if this is a popular solution, this might be unavoidable in our current environment, at least in some cases
Then, cast Tlincalli Hunter to start casting your Adventure creatures for free