Matta, Frigid Acrimony

Nonbasic Lands become Wastes once they tap.
Whenever Matta attacks, you may create a
3/3 Legendary Black Dinosaur token named
"Daz" with menace and:
"{t},sacrifice a waste: target player discards a card"
{r}{r}{t}: Destroy target Waste.
Its controller creates a Mountain.
{u}{u}{ut}: Return target nontoken creature to its owner's hand.