They are allowed 2 each which they keep if they get right.
The third umpire got one decision hopelessly wrong, I couldn't believe the system gave one out lbw today one was out but Australia ran out of reviews. In football how would it work? Limit it decisions still are wrong make it infinite and players will abuse to delay the game. It's a joke. More lbws will occur now in 10 years than the last 100.
Will it just be "has it crossed the line?" to start off with.
I think it will help personally but I hope it is just for the referee to use as it would get silly calling the captains over to dispute and use a challenge as how often per game is there a "did it cross the line?"