Congratulations ! You just found my secret ideas list.
Note that they aren't all good.

- Dumb Stick : Huge knockback, destroyed when used but with eternal so it returns to your base.
- Chaotic arrows : When they hit, they apply a random negative potion effect to players near the position they landed, players hidden behind blocks can be affected.
- Force players to be in adventure mode in Nether and make an arena there to gain an objective (what objective ?).
- Pickaxe of Growth : Eternal, stone pickaxe, starts weak, dealing damage with it increases its damage multiplier, you can get OP with it.
- Ender arrows : When you hit a player with it, you teleport to the position of this player.
- Machine Gun : Crossbow with Quick Charge 5, low durability.
- Heal Wand : Golden sword, when you look at a player from the same team with it, he receives regeneration and speed.
- When the score 14-0, the losing team gets : Elytras for all players, unlimited fireworks, and TNT.
