Nora Valkyrie, Thunder Heart

Trample, haste, rampage 3
If any opponent plays a Lightning spell (a spell
with "lightning", "bolt", "shock", "thunder",
etc., in its name), it targets Nora Valkyrie,
Thunder Heart as well as it's intended target.
Nora Valkyrie, Thunder Heart gets +5/+5 until
your next untap step.
"Boop!"