The primary limitation with physical cards is not everyone has access to them, whether due to their price, supply, or availability in certain areas
I laid this all out a couple of weeks ago, but the part I undersold that keeps coming up is that your opponent cant really fire back into an Oko that used its +2 on-curve
It doesn't make creatures completely immune to all interaction like hexproof does, but it does give them a nice chunk of extra survivability
Given Final Fantasy first debuted in 1987, theres no shortage of different aesthetics that Wizards of the Coast could use
Just make certain to try and bait opponent removal with other Dragons before finally slamming Silumgar down
One thing Sorin does excel at over many other walkers is his ultimate which isn't all that situational, doesn't cost too much and should win the game convincingly