PUNKs are pretty good in this event.
Edit: 11k gems into the pack total, and I'm still missing 2 Reinohearts, a Perlereino, and a Scream.
Mr God Jackstar, the Unfathomable Abyss, the Dancing Stardust of Sagittarius, the Blazing Inferno of Frozen Hell, Second Principal Leader of Incomplete Brigade