What materials can be lost wax cast easily?
It depends: What is your mold material ? I expect any type of glass  would fuse to any ceramic mold materials I am familiar with ( mostly alumina). And many glasses get soft and bendable at 1500 F , but that is nowhere  near liquid which will be 2200+ F.  How hot can you get your melting furnace? High alloy stainless ( 310 = 25 Cr : 20 Ni) melts "low" and has excellent fluidity. Vitalium is relatively unusual but common ( cobalt # 21 , Co + Cr) ; is used for silver colored dental applications and jet engine compressor blades. Maybe start with tin ( AKA pewter) very low melting ( roughly 600 F), good corrosion resistance.