Alistar vs Swain

Cast Pulverize (Q) during the Headbutt (W) charge: it's your core engage, and the target takes a knock-up as soon as you arrive.

Stay in melee range during Trample (E): each pulse that hits a champion gives you a stack, and at max stacks your next auto stuns.

Get behind your target, then cast Headbutt (W) toward your team: the charge knocks them back along your path, straight into your allies.

Cast Unbreakable Will (R) when you dive under a tower or get focused: it removes all CC on you and reduces the damage you take.

Get out of the Nevermove (E) path as it comes back: it only roots on its return to Swain, then he can pull each rooted champion to him.

Leave the area as soon as Vision of Empire (W) appears: it strikes and slows 1.5 seconds later, and each champion hit gives him a Soul Fragment.

During Demonic Ascension (R), back off and hit from range if you can: he only drains nearby enemies, and his form ends when he stops draining.

If you have Grievous Wounds, apply it during Demonic Ascension (R): the drain heals him every second, and that healing keeps him alive.