It gives you another medium to show off your favorite things in the context of a brilliant game
As of now, though, the most expensive Doctor Who card is this, at $1500

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How to play: online edition If you dont have any friends you can beg, bribe, or beat into playing Magic with you, there is another, far easier option: the games online version, Magic: The Gathering Arena
Otherwise, you could forget about the top-of-your-deck plan and play a generic Esper control / good stuff strategy