For a detailed authentication process, see our fake detection guide
You see, for the first couple years of Magic, the color red was largely a support color, primarily contributing burn spells, artifact and land destruction, and a variety of niche spells for special occasions
Be Sure to Enable Detailed Logging If you aren't seeing your Vault progress in the logs, this is due to the September 2019 MTGA update that defaulted user settings to use minimal logging
Mono-color samurai like Iizuka the Ruthless, Nagao, Bound by Honor, Opal-Eye, Konda's Yojimbo, and Sensei Golden-Tail just dont do enough or interact with a particularly relevant creature type
There is quite a bit of gambling done for this to work well, but, when successful, could be useful in building up a hand