What's he gonna do? Throw cubes at me? Oh I'm so scared.
Later...
HE'S THROWING CUBES AT ME! HELP!
He could:
-Drop an anvil :]
-Drop TNT >:]
-Use a lava bucket >:] or water bucket
-Use a bow, crossbow, sword, pickaxe, axe, shovel, hoe, or trident as a weapon
-He could use other items and blocks as weapons; maybe he could hold out a chest and shut it on an opponent, and it could absorb a projectile while open. There’s also dispensers and pistons and whatever
-Use fireworks and an elytra or an ender pearl for recovery
-Craft better armor/weapons for a temporary upgrade
-Place blocks down to block opponents or help in some other way (blocks would have limits so it’d be balanced)
-Potions, splash potions, enchantments, flint and steel, fire charges, tipped arrows, snowballs, eggs, spawn eggs, fishing rod, minecart, minecart with TNT >:] , etc.