To me Platina Ezel is one of the best cards to work with. It already has a standard 13k if Blond Ezel is in the soul, making it harder for your opponent to deal damage to you.
It's Ultimate Break is very useful, unlike Soul Savior Dragon that can power up 3 units, Platina Ezel can power up to 5 making the opponent guard an extra 10k SLD for every attack.
Strategies and game play:
It's wise to use it in the late game when your opponent has 4 or more damage which can make him lose a couple ten thousands of SLD to block your attacks to avoid losing the game.
Combos with other cards:
Units that get powered up by Ezel are essential around this kind of build making your opponent take more damage and losing more SLD, like : Badgemagus
You can also combine this card with Corron to get it Easier.
Ways to counteract it:
Prevent the opponent from having 5 damage and instead attack his rear-guard when he has 4 damage and his doomed. Finish the game when he has 4 damage at the start of your turn.
Able to decraese opponent's hand massively.
Easily able to finish the game when opponent has 4 or more damage
Not having enough unfliped damage or having only 4 damage and your doomed.
It is only available in Japanese in the Booster Set 9 : Clash of the Knights and Dragons
Artwork and aesthetics:
I like it very much. It resembles a little of Majesty Lord Blaster having both "Light" and "Shadow" attributes.
Overall I would give this card a 9.2.