How do you draw a game without going to time? You can't cast effects that kill yourself even if they also kill your opponent. (Library shenanigans notwithstanding.)
Specifically, how, in this limited format, do you "draw" in-game without going to time?
On the bolded: wha? Sure you can. You may be thinking of not being able to (usefully) cast spells / activate abilities where the COST causes you to lose because you'd be gone before the spell/ability resolves. But there's nothing stopping you from, say,
Earthquakeing or
Hurricaneing or
Crypt Ratsing for a draw.
On draw possibilities in this environment:
You could simultaneously reduce both players' life to 0 with
Arc Lightning. I can't imagine the scenario where this would be a wiser choice than simply dealing all 3 points of damage your your opponent though.
Aha. An
Ashcloud Phoenix turning faceup could cause both players to drop to or below 0 life at the same time. And I can imagine scenarios where that's a good idea (for instance if the game is 2-2, and you have just Ashcloud Phoenix facedown and the mana to morph it, while your opponent has a
flying 2+ power attacker - your opponent will win if you don't block, so it's better for you to flip the Phoenix and take the draw than choose not to and take a loss).