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Apr 19, 2012 -- 10:04PM, meb9000 wrote:

1) After Brainstorm resolves, you win the game, since during its resolution, the event "You attempted to draw a card from an empty library you (lose->win) the game." occurred. After the resolution, state-based effects are checked and you win.

Actually they win the game as they attempt to draw their last card, during the resolution of brainstorm.  Laboratory Maniac has a replacement effect that replaces the card draw with winning the game.  The brainstorm will never finish resolving and state based action will not be performed.

Apr 19, 2012 -- 9:52PM, Fonthiel wrote:

Do things such as Ballyrush Banneret effect things such as prowl or evoke costs? I dont believe so, but a few players in my group have brough it up and we have gone with that you cant so far.

Prowl and Evoke are ALTERNATIVE costs.
These allow you to pay something else instead of the «regular» mana cost of the card. 
Banneret's ability produces a cost reduction; cost reductions (and aditionnal costs) are always applied to the total cost,
after you've decided whether to pay the regular mana cost or some alternative cost.



702.74a Prowl is a static ability (...) Paying a spell’s prowl cost follows the rules for paying alternative costs in rules 601.2b and 601.2e–g.

702.72a Evoke represents two abilities (...) Paying a card’s evoke cost follows the rules for paying alternative costs in rules 601.2b and 601.2e–g.

601.2b [Casting a Spell] (...) If the spell has alternative or additional costs (...), the player announces his or her intentions to pay any or all of those costs (see rule 601.2e). A player can’t apply two alternative methods of casting or two alternative costs to a single spell...

601.2e The player determines the total cost of the spell. (...) The total cost is the mana cost or alternative cost (as determined in rule 601.2b), plus all additional costs and cost increases, and minus all cost reductions...