Boost??

[OUTLAWSTAR FAN15]

DOES BOOST ENERGY :colorless :colorless :colorless ONLY COUT FOR COLORLESS ATTACK COSTS? OR ANY COLOR?

 

[Chrisbo]

Those are colorless symbols, not "rainbow". Boost Energy only provides colorless energy.

And please don't type in ALL CAPS; it is considered shouting and is not appropriate for this forum.

Thanks,
- CHRISBO