Reality Warping is the power to change the properties or appearance of things, beings and even physical or spiritual laws by literally changing reality itself, or even constructing a new aspect of reality. It can be extremely powerful if used properly.
It can also be accomplished by certain objects, like the Tiamat Coin or Rabbit's Foot.
Many powers can be seen as a form of Reality Warping:
Conversion - Changing the properties of a being and thus transforming it into something different.
Conjuration - Create something (alive or not) out of nowhere.
Healing - Heal the injuries of a person (supernatural or not).
Resurrection - Make a soul leave their dead place and go back in the living world.
As shown with Gabriel, archangels are capable of warping reality to unimaginable degrees. They can create time loops and spontaneously create or uncreate pretty much anything.
Gabriel - Gabriel was phenomenally talented with this power, being able to do things in winks, snaps, gestures and even thoughts. Once, he even put Sam and Dean in a TV universe.
Lucifer - Lucifer apparently taught Gabriel everything he knows about this power and therefore outdo everything Gabriel ever did. He once combusted Castiel with a snap of his fingers.
Lucifer kills Castiel with a snap of his fingers.
He was also able to turn on music from out of nowhere in Limbo with a snap of his fingers.
Castiel - Castiel was able to shake a 'Sorry' board game and, instantly, everything was set up. Later on, he was able to send his blood into a glass by holding it.
Any demon requires at least a deal to bend the laws of the universe. Azazel is one of the strongest because he doesn't require a soul in payment from a deal, and Lilith claims she can do this but never demonstrated it.
Patrick (made deals that made people older or younger)
Objects and Sigils
Rabbit's Foot - Makes the wearer extremely lucky (until they inevitably lose it).
Tiamat Coin - Initially requiring a bearer, this coin could fabricate wishes into reality; in that it makes any iterated/thought wish come true but with an unexpected adverse effect.
Tulpa - thought form projections could alter reality, the extent of which is limited only by the creativity of the thinker.
Amara - She is able to completely annihilate everything she wants, including the universe, the spiritual realms and all life in existence. Prior to the creation of the universe, she destroyed multiple worlds God created. She once turned Metatron into nothing.
Fairies - Some powerful fairies can alter reality.
Fred Jones - Through sheer mental will he could reshape reality.
God - He can not only warp reality to a nearly unlimited extent, but also create new realities. Prior to the creation of the universe he created multiple worlds.
Mythmaker - a person who is blessed with very strong intent. By such a level of intent, they are even capable of bringing art to life. Eventually, the mythmakers turn myth into reality. Mythmakers, trained or not, were born with very high level Reality Warping powers. A mythmaker is a natural-born talent, and cannot be obtained through means of magic.
Soul Eaters - Soul Eaters possessed unique and somewhat very large powers to create their own dimension called "The Nest". Naturally, Soul Eaters inhabit a plane between the human world and another, a sort of inter mundi that exists outside of time and space, and by tapping a large amount of their powers (according to Sam), they created it when hunting their prey. The Nest takes on the appearance of the home it is in, albeit much darker and twisted to mess with their victim's emotions and make them vulnerable and tamed.
