Kristeel

The Kristeel Archtype differs from all other archtypes in that it consists only out of Spell and Trap Cards. They include loads of new Trap Monsters and added a new kind of Spell Cards aswell, the Spell Monsters. Spell Monsters always need at least 1 Tribute to be Summoned and are Continuous Spell Cards. They also introduced with the Spell Monsters, a new kind of Summoning, Gemini Spell Monsters, namely Celestial of Kristeel. All Kristeel Spell & Trap Monsters all have "of Kristeel" in thier names, suggesting that they all originate from the supporting Field Spell Card "Kristeel the Land of Dreams". All Kristeel monsters are (partially) made out of an Icy blue crystal (except for Inferno of Kristeel, who is made from red crystals).

Playing Style
The general strategy is using cards like Eagle of Kristeel to swarm the field with other Kristeel Trap Monsters and then Tribute them for the Spell Monsters. Or recycle them with cards like Teachings of Kristeel or Balin of Kristeel. Adding multiple Kristeel the Land of Dreams is wise as they limit the Card Zones that both Trap as Spell Monster need, by also including some Prophet of Kristeel this can be speeded up a bit. As you'll easily run out of cards in your hand this way, you'll need some way of replentishing your hand aswell. Magic Planter would be a great way to do this, as the Kristeel monsters can easily recycle themselfs. As they are also vulnirable too cards like Jinzo or Royal Decree siding cards like Double Snare or Breaching the Barrier would be wise.

You could also try a different aprouch and include some "Uria" or a Hamon in this. For a nasty suprise for your opponent.

Weaknesses
Thier main weakness is the fact all are still treated as Spell & Trap Cards, besides also being Monster Cards. Making them very vulnirable to both Spell & Trap destroying effects as monster destroying effects. Also cards like Jinzo, Royal Decree, Spell Canceler or even Trap Eater would stop half from the cards from being used. And as they mostly rely on recycling themselfs from the Graveyard, Remove from play effects would also be wise too use when facing them.