I would like to suggest to add buffs to a new tier of chests (higher than gold). We can merge 3 gold for this new chest, or 5 gold for 2 new chests. There will be new keys as well.

Buffs can be in the form of events that we players love but maybe just 15 mins?

Buffs:
Double xp
Energy Fiesta
Fast Forward
Super Supplies
Lucky Charm

There can be other buff rewards as well. Feel free to suggest~