in http://www.gitorious.org/crawl/crawl/blobs/stone_soup-0.10/crawl-ref/source/xom.cc, line 1214:

    potion_effect(pot, 150, false, false, false);

in http://www.gitorious.org/crawl/crawl/blobs/stone_soup-0.10/crawl-ref/source/decks.cc, line 1496:

static void _velocity_card(int power, deck_rarity_type rarity)
{
    if (you.religion != GOD_CHEIBRIADOS)
    {
        const int power_level = get_power_level(power, rarity);
        if (power_level >= 2)
        {
            potion_effect(POT_SPEED, random2(power / 4));
            cast_swiftness(random2(power / 4));
        }
        else if (power_level == 1)
            potion_effect(POT_SPEED, random2(power / 4));
        else
            cast_swiftness(random2(power / 4));
    }
    else
    {
        simple_god_message(" protects you from inadvertent hurry.");
    }
}

In http://www.gitorious.org/crawl/crawl/blobs/stone_soup-0.10/crawl-ref/source/decks.cc , line 1572:

static void _flight_card(int power, deck_rarity_type rarity)
{
    const int power_level = get_power_level(power, rarity);

    // Assume something _will_ happen.
    bool success = true;

    if (power_level == 0)
    {
        if (!transform(random2(power/4), coinflip() ? TRAN_SPIDER : TRAN_BAT,
                       true))
        {
            // Oops, something went wrong here (either because of cursed
            // equipment or the possibility of stat loss).
            success = false;
        }
    }
    else if (power_level >= 1)
    {
        cast_fly(random2(power/4));
        if (you.religion != GOD_CHEIBRIADOS)
            cast_swiftness(random2(power/4));
        else
            simple_god_message(" protects you from inadvertent hurry.");
    }

    if (power_level == 2) // Stacks with the above.
    {
        if (is_valid_shaft_level() && grd(you.pos()) == DNGN_FLOOR)
        {
            if (place_specific_trap(you.pos(), TRAP_SHAFT))
            {
                find_trap(you.pos())->reveal();
                mpr("A shaft materialises beneath you!");
            }
        }
    }
    if (one_chance_in(4 - power_level))
        potion_effect(POT_INVISIBILITY, random2(power)/4);
    else if (!success)
        canned_msg(MSG_NOTHING_HAPPENS);
}

In http://www.gitorious.org/crawl/crawl/blobs/stone_soup-0.10/crawl-ref/source/decks.cc , line 1948:

static void _potion_card(int power, deck_rarity_type rarity)
{
    const int power_level = get_power_level(power, rarity);
    potion_type pot_effects[] = {
        POT_AGILITY, POT_AGILITY, POT_BRILLIANCE,
        POT_BRILLIANCE, POT_MIGHT, POT_MIGHT,
        POT_CURING, POT_CURING, POT_CONFUSION,
        POT_SLOWING, POT_PARALYSIS
    };

    potion_type pot = RANDOM_ELEMENT(pot_effects);

    if (power_level >= 1 && coinflip())
        pot = (coinflip() ? POT_MAGIC : POT_INVISIBILITY);

    if (power_level >= 2 && coinflip())
        pot = (coinflip() ? POT_SPEED : POT_RESISTANCE);

    if (you.religion == GOD_CHEIBRIADOS && pot == POT_RESISTANCE)
    {
        simple_god_message(" protects you from inadvertent hurry.");
        pot = POT_WATER;
    }

    potion_effect(pot, random2(power/4));
}