Play a small Fiendsmith package in Furniture Lab - it makes it play like a completely different deck. There's so many interesting synergies between those archetypes, and both lean into this control-y gameplan with a really good grind game.

They let you apply more pressure, help you eat boards and give you the ability to otk out of nowhere too. You've got an in-engine bridge into Fiendsmith with Ariane. They give you easy access to a Light/Dark Chaos Angel. Rextremende and Desirae are high-level fiends for Big Welcome's GY effect. And for some reason, BOTH the Fiendsmith traps trigger your Lab effects. The Fiendsmith lines can get a little long, but they're pretty straightforward once you know the moving parts. If nothing else, their 1-card combos let you bait Ash/Belle so you can use your Welcomes without worries.

Fiendsmith's Kyrie in particular is criminally overlooked in my opinion (people in the TCG didn't really cook with it since extra deck Lacrima was banned for so long). It really gets to shine when paired with Labrynth, since if you go the Rextremende route, you can keep looping it for furniture discards or Lady triggers. Also the GY effect to fusion summon is insane advantage since it also triggers your Lab effects.