And the abilities that the network created itself, like Tromple (an amusing mangling of Trample) simply existed unexplained on some cards until it was illuminated by Adakar Vitionary: And of course, because MTG has so much flavor each of the five colors in MTG have their own style of play, most-used mechanics, naming principles, etc
However, this is a really risky card to play
You get lifegain and card advantage based on the sacrificed creature's power, making it a versatile creature that can fit into many archetypes
Wild Mongrel is already a great creature, but when paired with double-strike effects like Double Cleave or Soul Fire, or madness cards like Basking Rootwalla or Reckless Wurm, it becomes one of the best cards in your deck
It also means that if you really want access to these effects as a Commander player, you have a much more affordable route to getting a card with the same effect