If done right, Beast, Relentless can continually challenge or quests so long as you have other characters that can deal damage to opposing characters
Assuming youre interested in giving the original Final Fantasy VII game a go, this is a strong bundle option
He even got his own spin-off game, Dirge of Cerberus, which fucking RULES, by the way
It's very strong in decks that need to dig, fill up the graveyard, want to force foes to discard, and loads more
Several different Lorcana podcasts will get you caught up to speed on the latest metagame developments
"Kingdom Hearts fan questions answered in interview with series creator Tetsuya Nomura"