Rainbow Gravity

Normal Trap

If you have 7 "Crystal Beast" cards with different names on the field or in your Graveyard: Special Summon 1 "Ultimate Crystal" monster from your Deck or Graveyard, ignoring the Summoning conditions.

Rulings – Yugipedia

Printings:

Light of Destruction: LODT-EN065 (Common) - 2008-05-13
Legendary Collection 2: The Duel Academy Years Mega Pack: LCGX-EN174 (Common) - 2011-10-04
Ra Yellow Mega Pack: RYMP-EN057 (Common) - 2012-02-17
Legendary Duelists: Season 1: LDS1-EN115 (Common) - 2020-07-02
Speed Duel GX: Duel Academy Box: SGX1-ENF18 (Common) - 2022-03-17

Prices:

Cardmarket: 0.09 €
TCGplayer: $ 0.07