How I can build attack & different lab without buying a server to set up network

Example《bank》

building a bank network, realistic one and attack it and defend against the attack using SIEM,SORA,IDS,IPS,AD and do all cyber security procedures

Cyber Kail chain

Soc procedures , incident respons procedures, digital forensics ,

Well article above help but I need the cloud version how to setups and how much could cost

Vendor: Shelly Blog and POC: https://www.exploitsecurity.io/post/cve-2023-33383-authentication-bypass-via-an-out-of-bounds-read-vulnerability