Kessika, Hunt Leader

When Kessika, Hunt Leader enters the battlefield,
it becomes nighttime.
At the beginning of your upkeep, if it's nighttime,
target creature you don't control deals damage to
its controller equal to its converted mana cost and
you gain that much life unless that creature's
controller sacrifices it.
{2}{g}: Kessika, Hunt Leader gains hexproof until
end of turn.