Kennen, Heart of the Tempest

Whenever Kennen deals combat damage to a
creature, tap that creature.
Lightning Rush—{u}{r}: Kennen gains
First Strike and Haste until end of turn.
Slicing Maelstrom—{2}{u}{u}{r}{r}{t}: Tap up to
4 creatures target player controls and deal 4
damage to each of those creatures.
Balance in all things