It appears that they are explicit abilities, not inherent as in paper Magic, to simplify the rules implementation and type-changing effects in Arena
This deck is built to maximize the suite of incredibly powerful one-mana creatures seeded across white and black in Theros Beyond Death and M21
Other than being red these do not have especially great overlap with Sneak Attack style effects
I used to play in a lot of tournaments, and Ive played Magic for a long time
Wilds Unknown brings my favorite Pixar franchise ever, Toy Story, to one of my favorite card games
The card reads: Whenever one or more nontoken creatures you control die, create a green Fungus Dinosaur creature token with base power and toughness each equal to the total power of those creatures. If your creature dies, it just comes back to life as a mushroom dinosaur