You can drop a remnant while zipping with Ball Lightning, so place it mid zip so it explodes on the enemy as you pass through.

In the late game with enough mana you can place three or four remnants in a chokepoint before a fight starts.

Use remnants to scout Roshan, check high ground or spot incoming ganks in the jungle.

Without Vortex enemies can simply TP, BKB or use mobility to escape after your initial zip.

You can cast Electric Vortex while inside Ball Lightning, so pull targets as you pass through them.

Storm rewards mana management and predicting enemy positions, so calculate costs before committing or you zip in with no mana and die.