Talk:Boost/@comment-5570760-20121108220345

Also quick experiments show that fused cards give just a straight doubling of experience.

By my numbers, from levels 1 to 19 you should use simple base cards for maximum efficiency in silver usage. From level 20 up you should use fused commons, but unfused higher cards. From where my numbers fall off, level 30 I believe it's more efficient to fuse commons and uncommons before using them to boost, but that's only a guess.