Karma vs Nami

Hit the enemy with your spells: Gathering Fire (passive) lowers the cooldown of Mantra (R) with each damaging ability.

To poke, cast Mantra (R) then Inner Flame (Q) at a group: the explosion leaves a ring of fire that slows and deals more damage.

At low health, cast Mantra (R) then Focused Resolve (W): you restore part of your missing health at the start and end of the tether, and the root lasts longer.

In teamfights, cast Mantra (R) then Inspire (E) on an ally surrounded by the others: everyone gets a shield and move speed, to engage or to escape.

Change direction when she casts Aqua Prison (Q), then step up if she misses: it's her only stun outside her ult, on a 12 to 8 second cooldown.

Avoid trading when she casts Tidecaller's Blessing (E) on her ally: their next autos and abilities slow you and deal more damage.

Step out to the side of Tidal Wave (R): it travels a long way but moves slowly, and its slow lasts longer the more distance it has covered.

If you can engage, target Nami when she steps up: with no dash or leap, she can only walk away.