Yorick vs Nasus

Hit a champion or last-hit a minion with Last Rites (Q) to dig a grave: with three graves nearby, recast the spell to raise Mist Walkers from them.

Hit your target with Mourning Mist (E): your nearby graves keep raising Mist Walkers, the target loses armor, and your units rush toward them.

Trap your target in Dark Procession (W): the wall blocks enemies but not your allies, and your Mist Walkers hit them in the meantime.

After 10 seconds, recast Eulogy of the Isles (R) to send the Maiden of the Mist to push the nearest lane, but you lose a big part of your power.

Early on, take a trade whenever he steps up to last-hit a minion: each kill with Siphoning Strike (Q) increases its damage for the whole game.

Freeze the wave near your tower: to farm with Siphoning Strike (Q), he then has to step up and expose himself to ganks.

Once he hits level 6, don't engage during Fury of the Sands (R): for 15 seconds, he gains health and resistances, and his area damage scales with your max health.

In teamfights, if you're ranged, hit him while backing off: he has no dash, only Wither (W), a slow that grows stronger over time.