Join forces
Join forces is an ability word introduced in Commander.
Join forces allows multiple players to pay mana to increase the effectiveness of the same card. Starting with the controller of the card with Join forces, each player may pay any amount of mana. Then, an effect based on the total amount of mana paid by all players occurs. All join forces cards included in the set have symmetric effects that benefit all players equally.
Examples
Color percentages
There is a total of 5 cards that involve join forces, which divide by color as such:
- Black = 20 %
- Blue = 20 %
- Green = 20 %
- Red = 20 %
- White = 20 %