The best use of Saw in Half is to kill your own creature in response to a removal spell, which not only invalidates that removal, but also potentially gives you a big advantage by doubling up on that creatures abilities
Paired with something like an Underworld Dreams and when an opponent draws this is game over
The value of Magic: The Gathering cards can vary
Functionally, these cards are the same as the EX forms of the Pokmon
Although Charizard has never been officially classified as a Dragon type (despite Alolan Exeggutor somehow making the grade) he still makes it into the Sun & Moon Dragon Majesty special set (special in the sense it couldn't be bought in booster boxes and was only available in collection boxes, pin boxes etc.)
This is basically Rampaging Baloths in the command zone, except these are bigger tokens with a more relevant creature type, and Omnath benefits you if they die