2019 Fantasy Football Dynasty League Tips, Strategy Dynasty fantasy football leagues have been blowing up the past few years. And why not? It’s arguably the most challenging fantasy format. You want to win this year, but you also always have your eye on the future in the form of trades and potential keepers. This isn’t a check-your-lineup-once-a-week league; It’s a pay-attention-to-the-NFL-365-days-a-year league. As such, fantasy owners are always looking for advice and draft strategy tips when putting together their dynasty rankings and cheat sheets.