So this is a strat we found with my friend.
so basically you have to pick yuumi supp or jungle (if jungle dont take smite and supp is better anyways) then you go duo toplane with a singed.
laning phase is pretty easy you just have to poke the enemy toplaner so much so that he has to stay under turret, you really need him to be as far away as possible so he doesnt get farm or xp (go in bushes to lose minion target) and if ever ganked hope on singed immediately, take platings and couple of kills (diving the low enemy toplane if you did a good poking or killing the jungle if he ganks).
then mid game you should be focusing on herald after you took first tower top (or to take first tower top) maybe gank mid and steal the enemy jungle (blue buff is great to have on yuumi early but better on singed late) if possible go take a dragon, roam as much as possible and try to get kills.
and late game probably wont happen if you are good with this but if it does just kill the enemies i guess.
hope you'll enjoy this silver strat (and yes it does work i have 94% wr but i am only in silver this probably doesnt work in higher elo's)