The Incarnation creature type debuted in Magic: The Gatherings Judgment set in 2002
They had strong value at the time of their printing in secondary cards
The ability to hold three weapons (or two if one is big enough to take both hands) is a Guardians dream come true
It's most obvious in the design, though, with a pixelated world that looks more like an extension of Pokmon Gold, Silver, and Crystal than anything else you can put your hands on
I wont highlight one-shot effects like combat tricks that you cant repeat or that only last for one turn
Some are obvious, such as Blue Suns Zenith letting you draw as many cards as you can pay mana for, while others are more subtle, like Light Up the Stage exiling cards and being able to play them