2 Shulker Shells, 1 Chorus Flower, and 2 End Rods make this ULTIMATE Mallet
Netherite Mallet
Shulker Mallet
Smith together your Copper Mallet and 1 Diamond Block
Copper Mallet
Smith together your Diamond tipped Mallet and a Netherite ingot
5 Copper Blocks (Unwaxed, Unexposed) and 2 Tinted Glass
Diamond Tipped Mallet