I also think high-end Modern, Legacy, and Commander staples that have not been reprinted recently will do very well in 2019
Win condition coherence: Your win cards should line up with your plan A sentence
It's often game over in 1v1, and the only thing that gives opponent's a chance in Commander is that it only triggers on the controllers combat
Well, I guess he's started seeing some play in Legacy, because of course he has
When it resolves, all players exile all creatures from their graveyards, sacrificing all the creatures they have in play, and then putting all creatures exiled from their graveyard and putting them all back into play
99 non-foil Magic: The Gathering cards, including lands