1.Arrow of luck,can be obtain it on snapshot 19W12B for 4% chance to have in fletcher trade 2.Debug block: use piston and push bubble pillar,can be obtain in some snapshots 1.13

those are both very good ideas. they should add those

Added a luck arrow Item subcategory! as for "Debug Blocks" that seems to be a grey area, we can defiantly look into adding more blocks though!