You NEED to use this Geode CHEESE! Best Defense Guide! - AFK Journey 

Niru is also very annoying since he can use his ult on the crystal to revive it which actually reverts the crystals that have been plundered. Plus, the season artifact which heals is quite strong as it can make the crystal itself very tanky. I didn't realize there were different crystal types so this might require the one that converts healing into shielding (like the one you have in this video).

I think it's funny when scarlita Boots the crystal off the map

Its late, but healing spell was broken with that crystal, it gave infinite shielding and only few units ,liek marile could kill it