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@grimlockdown
Two Spark Runs today. Now with 1,290% promotion i.e. green crowned Nautica and two bonus squad members. It took me 5 stages.
The best strategy is to have an overpowered green crowned TF who can survive 7–9 stages and two bonus squad TFs. It costs 9,200 sparks to promote a TF from 0% to 105% (gold crown). Four times 105% is 420% i.e. twice of that one gets from non bonus squad green crowned TF. It probably also means 1–2 stages less.