Proxima Midnight

Unoticed {u}: (as long as a creature entered the battlefield under an opponent's control this turn
you may cast this spell as though it had flash for
it's Unnoticed cost.)
When Proxima Midnight enters the battlefield
you may discard a card, if you do draw 3 cards.
At the beginning of your end step sacrifice
Proxima Midnight if you paid it's Unoticed cost.