>>1618859Basically the any color + draw 4 card is a really strong card. The rule is an attempt to nerf it/add layers to the game by allowing the opponent on the receiving end to 'challenge' the use of the card.
To win said challenge, the player must have had other options available besides that card, at which point THEY draw 4.
You lose if they had no choice but to play it, and draw 6
