You want to know my favorite counter to Riven?

If you know how to conserve on mana, this guy is perfect.

While she deals a lot of damage, Yorick can push her back while farming.

Whether its his Q, his W, or his E, you'll be able to farm just fine.

His passive gives him up to 15% reduced damage and 15% increased damage for each pet he summons.

Q deals 110% of his AD and for little cost, gives him a small bonus MS for 1 second, and a free pet.

W costs more, but it deals surrounding magic AP damage, slows those hit, by spell or pet.

E costs the same as W, sends out a small AD damage to 1 person, minion, or monster, and heals Yorick for damage done from the activation and pets damage to whatever.

But be careful, it may sound OP but Riven can jump right on top of you and kill you in an instant. Unless you have the right build, you will just feed.

The last thing is his ultimate. It doesn't just work after death, it works before as well. Get some AD and health, and use this ultimate to push to turret with no cost to you.

Yorick is not easy to play, but is fun to use. He is also fun to see dead, on your side with R or on the other side without his R.