G1 MLP's Rainbow of Light adds an extra rainbow when it emerges from Megan's locket. The card's info says:
HOFS-EN052:
Rainbow of Brilliant Radiance
Equip Spell
(This card's name is always treated as "Rainbow of Light".)
Equip only to a Nostalgic Pony-Type monster. If it is targeted for an attack or card effect, except "Rainbow of Brilliant Radiance": You can target 1 LIGHT "My Little Pony" monster in your Graveyard; banish that target, and if you do, negate the activation, and if you do that, destroy it.
Common