And yes, they gain life
That isnt a bad thing by any means, and its nice to see more legends being printed that seem to be geared towards other Constructed formats
The Doctor Who Masters of Evil Commander Deck includes 1 ready-to-play Blue-Black-Red deck of 100 Magic cards (2 Traditional Foil Legendary cards, 98 nonfoil cards), 10 Planechase cards, 1 six-sided planar die, a Collector Booster Sample Pack (contains 2 Traditional Foil or nonfoil special treatment cards, with 1 Common or Uncommon and 1 card of rarity Rare or higher), 1 foil-etched Display Commander (a thick cardstock copy of the commander card with foil etched into the card's border and art), 10 double-sided tokens, 1 deck box (can hold 100 sleeved cards), 1 Life Wheel, 1 strategy insert, and 1 reference card
Theres no major TCG on the market right now that allows you to play alone or co-operatively against the game itself
It doesn't matter whether or not the creature or creatures are still on the battlefield or whether the players or permanents they attacked are still in the game or on the battlefield