If you have a decent way to cheat it into play, that's something, and it may just serve as kind of a holding pattern to keep your opponents from executing their game plan if it's some kind of combo, but then you're just asking for your 7 mana investment, or cheated out fattie, to get taken out by removal
Players that don't get a specific card they wanted from the twelve random cards don't fret, as there are ways to expand a "Lorcana" collection
I could also see Sarkhan being the key piece of a R/B Control deck which is the kind of deck that always looks better on paper than how it performs because of the variance in its draw steps and lack of velocity to filter through the deck, the exact problem Sarkhan can solve
How to Order Your Commander Deck Box Ready to protect your cards in style
The deck I remember from Invasion block that spammed Prophetic BoltProphetic Bolt apparently never made it outside of my local meta
Not a four-of but something to seriously consider and test