Whenever a creature an opponent controls dies, put a +1/+1 counter on Sephiroth
Unless you fancy leaning into the (fairly random) vehicle subtheme that Revival Trance is sporting with cards like Setzer, Wandering Gambler, Id recommend cutting that fat and adding some more solid reanimation-focused picks like Alesha, Who Laughs at Fate or Caesar, Legions Emperor
An especially dangerous combo for opponents comes when a player combines Pride Lands, Simba: Protective Cub, Madam Mim: Snake, and Merlin: Shapeshifter to receive nearly infinite lore
And its not just about the items plenty of cards in the Sapphire help you play items easier and for less cost
From there, I picked up just about every Final Fantasy game I could get my hands on - including the MMORPG of the time Final Fantasy XI: Online - and tore through them
So, when looking at the most valuable cards from this suite, you'll see the likes of Ursula the Sea Witch and even Yen Sid, who's been featured in Fantasia and Kingdom Hearts