Is there any black or white cards that whenever opponent loses a life (or when I gain life) create a creature token?
I'm planning a combo with Corpse Knight and Impassioned Orator.
If so can you show me what set it is in. And if not can you tell me if there are any other combos I could use.
There are a lot of cards that cause you to gain life for a creature entering the battlefield (examples: Angelic Chorus, Answered Prayers, Auriok Champion, Essence Warden, Ajani's Welcome, Soul's Attendant, Soul Warden). As a result, I seriously doubt Wizards would print a card that creates a token when you gain life. See this search for things that combo directly off of life gain.
Meanwhile, a lot of things cause life loss, (not the least of which being damage), so Wizards tends not to print things that trigger off of life loss. See this search for how few results there are.
So to do this, you're going to need a three card combo. Let's take a "when a creature enters the battlefield, gain life" as the first combo piece. Here are some options (it's pretty hard to stay within white/black on this one):
Alternatively, you could just go for effects that make a bunch of tokens:
I cannot think of anything that combos with them for as many iterations as you want. There are a number of effects that create tokens once per turn based on gaining/losing life.
In standard (as both cards you mentioned are standard legal):
Regal Bloodlord
Resplendent Angel
Outside of standard, the best I can find is:
Crested Sunmare
Regna, the Redeemer
Angelic Accord
First Response
In general I think they are quite careful with this effect, and restrict it to happening once per turn specifically to not enable the combo that you're seeking.
PS - I will edit this later with link when I get home as currently at work.
The kind of strategy you are looking for is something that has been dubbed as an "aristocrat" deck.
The archetype relies on sacrificing your own creatures for value and is usually classified as aggressive. The original deck that did this was named aristocrats because two of its sacrifice outlets were Falkenrath Aristocrat and Cartel Aristocrat.
There is currently an Abzan version in standard as of M20 being released. Not sure how good this deck really is as I haven't tried but worth having a look at it.
Will post link and decklist later.
I am currently making a really cheap budget deck in black/withe zombie token summoning. here's the link
It is based on Reassembling skeleton and Ravenous harpy combo associated with some open the graves to spawn zombie tokens. Teysa Karlov doubles that number.
Then Vizier of the scorpion gives them deathtoutch while Graph harvest gives them menace.
I do not see why you can't make that deck with the cards you mentioned before.
