At first glance, this doesnt seem like a very efficient use of your land cards, but when you consider lands with enter-the-battlefield effects, as well as the ample land recursion options available , things get a lot more interesting
Nissa tends to be a lands-matter kind of Planeswalker, with most of her cards doing things like untapping lands (Genesis Mage, Sage Animist, Vital Force, Steward of Elements, and Worldwaker), animating them into creatures (Vital Force, Sage Animist, Shadowed Boughs, Steward of Elements), or giving you extra abilities whenever you play a land
Instant Color tag templates(None) Essence Vortex Destroy target creature unless its controller pays life equal to its toughness
It also forms the backbone of the competitive Ethan's Typhlosion single-prize deck, where each copy in the discard pile adds 60 extra damage to Typhlosion's Buddy Blast attack, giving it real dual-purpose value across both the collector and player markets
It doesnt specify that the creature needs to tap for mana, which means Eldrazi Scion and Eldrazi Spawn tokens benefit from the buff