It gives all creatures hexproof and indestructible for a turn, gives all players hexproof, and makes it so that no one can lose life, win, or lose the game that turn
You do this without revealing the cards, and you then draw cards until there are seven in your hand once again
Esper Terra's fourth chapter ability isn't a mana ability
Like most Magic: The Gathering cards, the value of The War Doctor depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Doctor Who)
Then in your Five-Color brews with five color leaders, this should be an essential, yet it's underplayed and not even crossing 500 copies among all decks despite the fact that it's very strong and five color is heavily played at the kitchen table