CHICKEN WARS!!! (Inspired by Skywars and Treasure Wars)
You gain eggs from your chicken at yours or anyone elses base, but if it dies you can no longer get eggs. You start with only two lives total, but it decreases to one if your chicken dies. If you have one life and the chicken dies, you are still alive 
.
Every 10 seconds, your chicken spawns an egg These eggs can be thrown and have a 25% chance to splash an effect…
Effect ideas:
Knockback Egg (Ground Wars)
Blindness Egg (Ground Wars)
Chicken Warrior (spawns an angry chicken)
Speed Egg (Speed 2)
Slowness Egg (Slowness 2)
CHICKEN EGG (Slowfalling, 5 hearts lost, Speed 3(Basically a Chicken))
All the effects would last a minute. (Except kb and blindness, blindness would be 5 seconds)
Like treasure wars, there would be three currencies. Raw Chicken (gold), Cooked Chicken (diamonds), and Feathers (emeralds)
Items you could purchase:
16 Wool - 5 raw chicken
16 Planks - 5 cooked chicken
16 Clay - 10 cooked chicken
Pickaxe - 1 Feather
Axe - 1 Feather
Pearl - 3 Feathers
Chain Armor - 30 raw chicken
Iron Armor - 20 cooked chicken
Iron Sword - 5 feathers
Stone Sword - 5 cooked chicken
Wooden Sword - 5 raw chicken
Bow - 20 raw chicken
4 Arrows - 1 cooked chicken