No, they can only enter the S/T zone when an effect places them there. They usually go there when destroyed, as per their own effect, but Sapphire Pegasus can place them there from deck too.
No, monsters can only be normal or special summoned to the monster card zone. Crystal Beasts go to the S/T zone when destroyed, you don't place them there automatically.
no, they are treated as spells
On their own, they do not do anything. Many Crystal Beast support cards need Crystal Beasts to be in the S/T zone though for them to have any effect. For example, Rainbow Ruins has a variety of effects, which can only be used when you have a certain number of Crystal Beasts in the S/T zone. Crystal Beacon needs you to have two as S/T cards, as its activation condition. Ruby Carbuncle can summon the S/T Crystal Beasts into the monster zone, etc.
no you cant use crystal promise something else this card is a trap that lets you summon rainbow dragon without crystal beasts rainbow dragon cant summon with crystal promise unless it was crystal beast rainbow dragon
No, they can not be used for Tribute Summons. The one scenario that they could be used as Tributes is to summon "Hamon, Lord of Striking Thunder" since Crystal Beasts in the Spell/ Trap card area are treated as Continuous Spells.
No, the Crystal Beast goes to the graveyard if tributed. Crystal Beasts only get to choose to go to the S/T zone if they are 'destroyed'. Tributing, or 'sending', are not destruction effects. Effects that destroy will say so on the card, and also monsters can be destroyed by battle.
When a card, such as Spell Striker, requires an action to be Summoned, the action will almost always be performed first before the monster is Summoned. Therefore, concerning Spell Striker, to Special Summon it, you must remove one Spell Card from play first, then you place it on the field afterwards.
get the card pack force of the breaker
the card number is 79407975 if you want to check go to http://yugioh.wikia.com/wiki/Rainbow_Dark_Dragon
No. A 'Crystal Beast monster' is a monster with the words 'Crystal Beast' in the name. So any card that works on a 'Crystal Beast' card, will not work on Rainbow Dragon, even though it is undeniably related to crystal beasts.
No, only from your hand. They can be special summoned from graveyard by cards like Monster Reborn if they were properly summoned initially before they went there. However you can't resummon them from the graveyard with their Ritual Spell Card.
I use a crystal beast deck and its awesome but my friend josh just made this badass D.D. (different dimension) deck and it usually wins against my crystal beasts. The thing that makes crystal beasts effective is is the effect they all share which is when destroyed, they can be put in the spell and traps area so he uses dimension fissure and macro cosmos. Dimension fissure removes your monsters from play when they are destroyed so if your opponent uses crystal beasts he/she cannot put them in spells and traps. Marco cosmos removes all used/destroyed spells and traps from play. When playing against a crystal beast user, these cards are espicially effective and can keep your opponent from summoning rainbow/rainbow dark dragon (I dont use it but most do) or using the magic card crystal abundance ( user must have 4 crystal beasts in spell and trap card zone to activate and by sending these to the graveyard every card on the field is destroyed but the user then gets to summon as many crystal beast from the graveyard as the number of cards destroyed on your side of the field) or the trap card crystal raigeki which lets you send one crystal beast card (as spell card) to destroy one card on the field)I agree with most of this answer, however using Dimensional Fissure as a counter to the crystal beasts is not as effective as you seem to think. Dimensional Fissure states that "Any monster sent to the Graveyard is removed from play instead." Whereas the Crystal Beasts all state in their effects that "If this card is destroyed while in a monster card zone you can place it face up in your Spell and Trap Card Zone as a continuous Spell Card instead of sending it to the Graveyard." Therefore the Crystal Beasts can be chosen to never be sent to the graveyard by their effect and so cannot be removed from play by Dimensional Fissure. However Dimensional Fissure, Macro Cosmos, Banisher of the Light and Banisher of the Radiance are still effective at countering the summon of Rainbow Dragon.