Haven't seen anyting posted for an Earth Main on Easy yet. Sharing what has worked for me.

Wave 1 - interupt top or bottom giant your team will kill the middle one before it c*e skill.

Wave 2 - Wait for Shizune to heal then pop Kakshi's skill ... need at least 3 lions on the field to finish her off.

Wave 3 - Interupt Karin with Earth Main then pop Kakashi skill. Save following Earth Main interupt for Hanzo's Poison Rain Skill. Unload on Karin whenever Kakshi's skill is off Cooldown.

Collect your rewards.