Talk:Rumble/@comment-7623587-20110422170314/@comment-142.177.235.175-20110422211426

Seems very much like he is manaless. His AA is melee and he only has one ranged ability aside from his ult. Xypherous has already confirmed that his ranged ability isn't high damage (http://www.leagueoflegends.com/board/showthread.php?t=683124&page=2), and since he presumably can't maintain himself in 'danger zone' early game it'll probably only be moderate harassment even without a mana requirement.

The 'no additional cost' part of his harpoon ability would presumably be 'no further heat generated.'

If he's primarily melee and his abilities already have one type of cost associated with them in heat I'd be very surprised if they also have either a mana or health cost as well.