MagicasquirrelTMT
Official Terrarian
Miner armor is just this kind of thing that you use if you can get your hands on it when it matters, but won't make a fuss out of it if you don't. It can help if you somehow luck your way into it early on, when you don't have chisel or cake, and miner potions are scarse. There are items that you're much more unlikely to get, like slime staff, but people managed to luck their way into it somehow, so just randomly getting miner armor on your first few undead miners seems totally possible to me.