Great Train Heist bugged
I moved to combat, my opponent used Sterling Keykeeper to tap one of my creatures, I let it resolve and before declaring attackers, still in same step, I cast Great Train Heist to untap creatures, have an additional combat step and also give +1+0 and first strike to my creatures. I got the +1+0 first strike and the untap, but I did not get an additional combat phase. As per my understanding, begginging combat step is part of combat phase so I should have had an additional combat phase
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Rezzahan#77802 commented
You probably did get an additional combat phase. But, first, you have to go through the whole of this one first, and second, you have to have a creature able to attack in the next combat phase. And seeing that you untapped before declaring attackers in that first combat phase, and then likely attacked with all of your creatures able to do so, taping them, there's none left to attack with the next combat phase.
edit:
Just tested it, and it's simply you not having anything to attack with. The card works fine.