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"Mountain" can be won via random drop from the following characters, when the player scores one of the listed ratings

Plenty of mono-white and Boros aggro decks already rely on combat tricks rather than anthems to enhance their threats, so existing aggro decks can easily use The Battle of Bywater without changing their card selection too much

Yes, its so that another being can drain all the life from it, but while the Doctor has to figure out how to save it, its an opportunity for the Eleventh Doctor to have a heart to heart with his longtime travelling companion

Once Black Lotus has generated this mana, you then discard it