Your Inescapable Doom Ongoing Scheme (An ongoing scheme remains face up.) At the beginning of your end step, put a doom counter on this scheme, then this scheme deals damage equal to the number of doom counters on it to the opponent with the highest life total among your opponents
It has evasion in the form of flight, and its power and toughness are each equal to your life total
Ive excluded [casthaven]Gemstone Caverns[/casthaven] (which essentially lets you turn being on the draw to being on the play), [casthaven]Urborg, Tomb of Yawgmoth[/casthaven], and [casthaven]Vesuva[/casthaven] since they dont produce multiple mana (but can when combined with lands on this list)
All the Eldrazi are popping off in some way, and that deck is proving super popular in the early orders, so it might be good that you can get Ulalek in Play boosters, too
Elves dont tend to have problems with mana generation, and the different modes just add that much more flexibility