Heres a modern omni deck i got. 4 chart a course, 4 tainted indulgence, 4 omniscience, 4 griselbrand, 2 atraxa, 4 malevolent rumble, 4 psychic frog, 3 grim tutor, 4 grapeshot, 2 impulse, 3 archdruid charm. 22 lands, 4 of which being shifting woodlands others mostly bug lands. Now im not sure on lands as this deck will be 4 color and not 3 color using grapeshot as the wincon and not tendrils. However you dont need red mana really as you can play grapeshot for no mana off omni. This is a very rough list based on my arena deck i like to play. Can win on turn 3-5 with good hands. Plan is fill Gy with omni and other stuff. Turn woodlands into omni play gris or atraxa for free, draw, play lots of spells then grapeshot for lethal. Might be too slow for modern as it can take a while to fill GY. However playing omni is very fun. Just an idea for a new deck. Now, the decks not perfect could be made better also.