Multi-Energy and Seviper

[Cazman]

A question about Multi and Rainbow Energy:

Seviper, from Sandstorm:
Attack#1: (C) Deadly Poison [10]
You may discard a (G) Energy card attached to Seviper. If you do, the Defending Pokémon is now Poisoned.

If I attached a Multi Energy or a Rainbow energy to Seviper, can I use it to pay for this attack and then discard it to inflict poison?

[PokePop]

Sure. That's a well established meta-rule.
If a card provides energy of a type, you may consider it an energy card of that type, as long as Basic energy card is not specified.

[Cazman]

Much obliged.