I'm further supporting Crystal Beasts by adding their Sixth Rangers and such

[Lonk]

Crystal Beast Gold Rat
Level 3
LIGHT
Beast/Effect
ATK/700 DEF/300

When this card is placed in your Spell & Trap Card Zone: Draw 1 card. If this face-up card is destroyed while it is in a Monster Card Zone, you can place it face-up in your Spell & Trap Card Zone as a Continuous Spell Card, instead of sending it to the Graveyard.

Crystal Beast Titanium Lion
Level 4
EARTH
Beast/Effect
ATK/1800 DEF/2000

This card cannot be Normal Summoned or Set. You can place this card in your Spell & Trap Card Zone (from your hand). When a "Crystal Beast" monster except "Crystal Beast Titanium Lion" is placed in your Spell & Trap Card Zone: Special Summon this card from your Spell & Trap Card Zone. If this face-up card is destroyed while it is in a Monster Card Zone, you can place it face-up in your Spell & Trap Card Zone as a Continuous Spell Card, instead of sending it to the Graveyard.

Crystal Beast Onyx Rattlesnake
Level 3
EARTH
Reptile/Effect
ATK/400 DEF/1000

When this card is placed in your Spell & Trap Card Zone: Destroy 1 card your opponent controls. If this face-up card is destroyed while it is in a Monster Card Zone, you can place it face-up in your Spell & Trap Card Zone as a Continuous Spell Card, instead of sending it to the Graveyard.

Crystal Beast Silver Bull
Level 4
FIRE
Beast-Warrior/Effect
ATK/1900 DEF/800

Once per turn; you can send 1 "Crystal" card from your Spell & Trap Card Zone to your Graveyard: place 1 "Crystal Beast" monster in your Graveyard onto an unoccupied Spell & Trap Card Zone you control as a Continuous Spell Card. If this face-up card is destroyed while it is in a Monster Card Zone, you can place it face-up in your Spell & Trap Card Zone as a Continuous Spell Card, instead of sending it to the Graveyard.

Gemstone Dragon
Level 8
LIGHT
Dragon/Effect
ATK/3500 DEF/3000

Cannot be Normal Summoned or Set. Cannot be Special Summoned except from your hand while there are 4 or more "Crystal Beast" cards in your Graveyard and your field with different names or by this card's effect. This card's name is also treated as "Rainbow Dragon". When this card is Special Summoned: Both players must place as many Monster Cards, from both each respective Graveyard and hand, on each respective Spell & Trap Card Zone as possible as Continuous Spell Cards. You can return 1 "Crystal Beast" card in your Spell & Trap Card zone to your hand; place this card in your Field Spell Zone. Neither player can activate any Field Spell Cards while this card is in your Field Spell Zone. While this card is in your Field Spell Zone: draw 1 card in addition to your normal draw during your Draw Phase. In addition, "Crystal" Continuous Spell Cards you control cannot be destroyed. If this card in your Field Spell Zone is destroyed: You can Special Summon this card from your Graveyard.

Back-up Crystal of Legends
Continuous Spell Card

You can Normal Summon 1 "Crystal Beast" from your hand or Graveyard in addition to your Normal Summon or Set. When this card is sent to your Graveyard: Special Summon 1 "Crystal Beast" monster from your Deck. The effect of "Back-up Crystal of Legends" can only be used once per turn.

Crystal Beast Gathering
Continuous Spell Card

Once per turn; add 1 "Crystal Beast" monster from your Deck to your hand. When this card is removed from the field: Special Summon 1 "Crystal Beast" monster from your Deck or Graveyard.

Rainbow Mega-morph
Normal Spell Card

Send 1 "Rainbow Dragon", 1 "Gemstone Dragon" and all "Crystal Beast" Spell Cards you control to your Graveyard; Special Summon monsters from your Extra Deck equal to the number of "Crystal Beast" cards sent to the Graveyard for this effect. Then, attach any number of "Crystal Beast" monsters in your Graveyard to any number of Xyz Monsters you control as Xyz Materials. During the End Phase: return all monsters Special Summoned by this effect back to your Extra Deck and Special Summon 1 "Rainbow Dragon" and 1 "Gemstone Dragon" from your Graveyard, ignoring the Summoning Conditions.

[Lonk]

YCM, y u no comment?

[Lonk]

Bump

[Lonk]

No love for these cards?

[.Exa]

Gemstone and Mega-morph seem a tiny bit OP, less noticeable for Mega-morph because of the heavy cost. But Gemstone Dragon is a bit OP. A beatstick or a no Field Spell card/double draw/crystal cards immune to destruction, and it's not even hard to Summon.

Also Gemstone: 4 or more, or exactly 4 Crystal Beasts, you didn't clarify that in the text.

[Lonk]

I mean 4 or more. Well, thanks for responding. Will fix that.