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[QUOTE=BearCavalry]When Battlesphere attacks, and I go to tap myr tokens to buff up the battlesphere, Can i tap the myr tokens, and while i'm still taping myr, sac 3 already tapped myr tokens to the forgemaster, and search my library for another battlesphere, then continue tapping myr.[/QUOTE]

you can tap for the battlesphere and then and then let the battlepshere abilitie resolve, after it you have the priority, you could sacrifice for the Kuldotha Forgemaster, for example to get another battlesphere and then tap for more damage, and then let the opponent designate bloquers
http://mtgsalvation.com/794-priority-and-the-stack.html
read this for more information about priority and the stack

BUt this combo is soooo very hard to do. You know that its going to be like 5 mana, and a few artifacts intact to do this right?

No you cannot do that. You can tap the myr, and then once the ability resolve use the forger, but you can ot tap the new myr for the battlesphere.

http://forums.mtgvault.com/showthread.php?t=2773

This was basically the same question, and it is explained why it doesn't work.