The Countdown Is at One

three generic mana one red mana Sorcery

Players play a Magic subgame, starting at 1 life and using their libraries as their decks. For the rest of the main game, if a source would deal damage to a player who didn't win the subgame, it deals double that damage to that player instead.

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Showing The List (Unfinity Foil Edition)#28

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The Countdown Is at One rulings

2018-01-19
To play a Magic subgame, all players start a new game, using their libraries as their decks. No other cards, tokens, emblems, or anything else from the main game are included in the subgame.
2018-01-19
If a player has fewer than seven cards in their main-game library, they’ll lose the subgame as it begins, regardless of how many mulligans that player takes.
2018-01-19
If the subgame is a draw, no player won the subgame, so damage dealt to any player in the main game will be doubled.
2018-01-19
After the subgame ends, all players shuffle their cards from the subgame to reform their main-game libraries, and they return to the main game from the point they left off, with The Countdown Is at One finishing resolving.

The Countdown Is at One keyword rules

Double Rule 701.9

Doubling a creature’s power and/or toughness creates a continuous effect. This effect modifies that creature’s power and/or toughness but doesn’t set those characteristics to a specific value. See rule .

To double a creature’s power, that creature gets +X/+0, where X is that creature’s power as the spell or ability that doubles its power resolves. Similarly, an effect that doubles a creature’s toughness gives it +0/+X, where X is that creature’s toughness. Doubling a creature’s power and toughness gives it +X/+Y, where X is its power and Y is its toughness.

If a creature’s power is less than 0 when it’s doubled, doubling that creature’s power instead means that the creature gets -X/-0, where X is the difference between 0 and its power. Similarly, if its toughness is less than 0 when doubled, it gets -0/-X. If one characteristic’s value is negative but the other isn’t when both are doubled, it gets -X/+Y or +X/-Y, as appropriate.

To double a player’s life total, the player gains or loses an amount of life such that their new life total is twice its current value.

To double the number of a kind of counters on a player or permanent, give that player or permanent as many of those counters as that player or permanent already has.

To double the amount of a type of mana in a player’s mana pool, that player adds an amount of mana of that type equal to the amount they already have.

To double an amount of damage a source would deal, that source instead deals twice that much damage. This is a replacement effect.