Pyke vs Alistar

Charge Bone Skewer (Q) from a brush or the fog of war: when held, it pulls the first enemy hit, and refunds mana if it hits a champion.

Dash through your target with Phantom Undertow (E): the phantom left behind returns to you and stuns champions in its path.

After a trade, get out of their vision: Gift of the Drowned Ones (passive) regenerates the damage champions just dealt you.

Cast Death From Below (R) on a target below the threshold: each champion who dies in the X lets you recast it, and your last assisting ally also gets the kill gold.

Roam or flank with Ghostwater Dive (W): you're camouflaged and gain a lot of move speed, which decays over time.

Take a trade right after his Headbutt (W): without it, he can't engage from range, and its cooldown is 14 to 10 seconds.

Back off when his carry is close enough to follow him, and play hard when they're far away: an Alistar engage only kills if someone follows up.

Once he hits level 2, stay out of Headbutt (W) range: combined with Pulverize (Q), he knocks you into the air as soon as he arrives.

If you have CC, save it for after Unbreakable Will (R): the spell removes the CC on him when cast, but doesn't protect him from what comes next.