δ Rainbow Energy (Japanese: δ レインボーエネルギー δ Rainbow Energy) is a Special Energy card. It was first released as part of the EX Holon Phantoms expansion.
This card was included in the English EX Holon Phantoms expansion, first released in the Japanese Holon Phantom expansion. It was reprinted in the EX Dragon Frontiers expansion, originating from the Japanese Imprison! Gardevoir ex Constructed Standard Deck. In Japan, it was later reprinted as a Holofoil PCG-P Promotional card and was awarded to participants of the regional Summer 2006 Battle Road events who reached the final round of the main tournament. It was later reprinted in the POP Series 5.
The design of this card's illustration resembles the set symbol for EX Holon Phantoms, the expansion in which this card first released.