Not including the static ability ones from War of the Spark that only had one minus ability, only Ajani, Caller of the Pride, Gideon Blackblade, Teferi, Time Reveler, and Vivien, Champion of the Wilds have at least 4 starting loyalty
Tracking down rare Japanese cards individually can be challenging, as they are frequently scooped up in the West
Mostly, this gives you a Zombie at the end of your turn if you lost 2 or more life, and losing life on your own turn isnt something that will just happen -- youll have to create situations to make that part work, and even though Black is always capable of doing that in Limited, it is highly unlikely you get a critical mass of those cards going that allows you to consistently make a Zombie, and you probably need to get at least two out of this for it to feel worth it
Obtaining Flair for a Pokemon card will not give players any advantages during online battles -it's simply for style