Just a couple of minor variants.
Firstly, it was said (by one of the so called “experts”) during the World Cup in Brazil that (statistically) the “better” teams usually win penalty shootouts.
Whether this is true or not I cannot say but if you believe it to be so then use the following rule:-
Any better ranked team may always re-roll one failed penalty roll in a penalty shootout. The re-roll has to be accepted even if it results in another failure.
To limit the use of this variant, you can say that for the purpose of this rule the black / red team are the highest rank, followed by the blue / green teams and then the yellow / grey teams. Therefore, for example, if a black team plays a red team then rule would not be used as they are deemed to be the same rank.
The second variant covers the situations that can arise in the later stages (eg, semis and final) where two teams of the same colour play each other and each have the same number of attack tiles in play. This renders use of the dice irrelevant as both team’s score will increase (if at all) by the same amount.
For example, if you have a black team with one attack tile vs another black team with one attack tile in the final then the dice will make no difference to the result (it may do to the score - but if it is a draw before the dice it will be a draw after the dice).
As a variant, for semi final stage and above, roll the dice once for the first named teams and then roll the dice again for the second name teams. So, for example, instead of rolling once in the semi final you roll twice, once for the first named team and then roll again for the second named teams. This should give now some extra excitement in the use of the dice as they may make a difference whereas before they could not if two ranked teams with identical numbers of attack markers were involved.
This may, of course, mean a black team with fewer attack markers against another black team comes out on top due to the roll – eg, say it is the final between two black teams and each has one goal tile but the first named team has an attack marker but the second one does not. If the first roll yields no black dots but the second one rolls two then the second team wins 1-2. Such is the randomness of football – just ask Brazil