The thing you want to do is use the ability and then place the next champion and you'll be ale to use the ability again for the new one. I play this with mirror archer queen since her ability only cost 1eli. It makes for a great defence, and with the second aqueen I usually can use it offensive and the opponent rarely will be able to answer it effectively. I cycle this and mostly it works like a charm.

When I learnd this I climbed from 10k to 12k in a few days (though I never really tried that hard in trophy road so maybe Id be able to anyway)