Imagine a critical teamfight erupting in the mid-lane. Your Marksman, who is your primary damage dealer, gets caught by an enemy assassin and is quickly losing health, falling to less than 20% HP. You are positioned safely behind your tank, but too far to directly heal with Love Waves.
This is the perfect moment to activate Heartguard. You target your Marksman, instantly applying a massive shield (1000 flat + 200% Total Magic Power) that absorbs the incoming burst damage, saving them from certain death. As you attach, you gain zero Mana cost for your skills. Immediately, you begin spamming Love Waves, healing your Marksman for 150 flat + 75% Total Magic Power HP with each wave, while simultaneously damaging and slowing the enemy assassin and applying Lover's Mark stacks. Seeing the assassin attempting to retreat, you quickly cast Puppet-on-a-String on them. The initial hit deals 300 flat + 40% Total Magic Power Magic Damage and slows them. You ensure the string remains connected for 3 seconds, leading to a 1.5-second immobilize and an additional 450 flat + 60% Total Magic Power Magic Damage, further amplified by any Lover's Mark stacks. This combination of shield, healing, and crowd control allows your Marksman to survive, turn around, and secure the kill on the now-immobilized and damaged assassin, winning the teamfight for your team.