The challenge description says Bifid before Rail Fence but in fact it's the other way around.
CyberChef decryption: [https://gchq.github.io/CyberChef/#recipe=Rail_Fence_Cipher_Decode(3,0)Bifid_Cipher_Decode('RAZICTF')&input=UkRUNFZBX19BMSRydEx7RV9fMFVQNFVEQVNJVUlZM31hRERPX0xDUl9I](https://gchq.github.io/CyberChef/#recipe=Rail_Fence_Cipher_Decode(3,0)Bifid_Cipher_Decode('RAZICTF')&input=UkRUNFZBX19BMSRydEx7RV9fMFVQNFVEQVNJVUlZM31hRERPX0xDUl9I)
Flag: `RaziCTF{ITS_4_G0OD_ST4RT_XTO_STUDY_C1PH3$}`