The 0 ability mills 10 cards at once, which becomes downright terrifying if you have something like Bruvac the Grandiloquent to double the effect
Even if Satoru leaves the battlefield before it resolves, you'll still be able to put the creature onto the battlefield tapped and attacking
The thing is that in Eternal formats where this card is legal, cheap 1-mana spells and fetch lands are among the most popular strategies, and the static effect on this card prevents those from hitting the graveyard
Whenever Yuma enters or attacks, you may sacrifice a land to draw a card, and whenever a desert is put into your graveyard from anywhere, you get a 4/2 green Plant Warrior token with reach
A good example of this is Prishe from FINAL FANTASY XI
Many of the original base keywords are "evergreen" and still used commonly in Magic design as of 2019, such as Flying, First Strike, and Trample