It is well-balanced and, cheating aside, the AI opponents are able to give a decent account of themselves, especially combined with the gradual process the player must go through to build his or her deck
These Chaos Emerald bonus cards are merely continuing this tradition, as prices are crashing already
That's what made Thirst special: unlike Frozen Solid and Dehydration, it tapped the creature RIGHT NOW, taking it out of combat for as long as you're willing to pay a blue mana
Its ironic that Magic: The Gatherings world and the one featured in Doctor Who feel so disparate
If they think it's worthwhile, they'll advise there
It doesnt have a lot of ways to deal with flying creatures and has trouble against First Flight and Draconic Destruction