Lands are the cards people actually use every game, so putting the flashiest treatment on the most-played card type means more tables see it, more often
Black green is one of the most common colour combinations which works in this cards favour but with Abrupt Decay now on offer and Beast Within as well the Pulse is no longer a card people want in their decks

The deck: Orc Tribal Comparative Analysis 35 Lands 11 Ramp : Relic of Sauron, Arcane Signet, Sol Ring, Burakos, Party Leader, Patchwork Banner, Treasure Nabber, Rakdos Signet, Izzet Signet, Sanar, Unfinished Genius, Tablet of Discovery, Mana Sculpt 15 Target Removal : Foray of Orcs, Feed the Swarm, Goblin Cratermaker, Fall of Cair Andros, Sarumans Trickery, Orcish Bowmasters (ping+), Brush Off, Fling, Souls Fire, Kazuuls Fury, Jwari Disruption, Self-Destruct, Pain for All, Artistic Refusal, Mana Sculpt 6 Board Wipes :Subjugate the Hobbits, Widespread Brutality, Blasphemous Act, Chandras Ignition, Nibelheim Aflame, Soul Immolation 4 Graveyard Recursion : Summons of Saruman, Treason of Isengard, Sauron, Lord of the Rings, Kess, Dissident Mage 1 Graveyard Hate : Bojuka Bog 2 Tutors : Waterlogged Teachings, Sanar, Unfinished Genius 6 Protection : Mana Sculpt, Sarumans Trickery, Whispersilk Cloak, Brush Off, Jwari Disruption, Artistic Refusal 10,5 Card Draw : Desolate Lighthouse, Relic of Sauron, Sauron, the Dark Lord, Artistic Refusal, Moria Scavenger, Deep Analysis, Faithless Looting, Thrill of Possibility, Moria Marauder, Plargg and Nassari (kinda), Rush of Inspiration, Tablet of Discovery (1/2) 13 Finishers/ Surprise /Alternate win conditions : Assault on Osgiliath, Fling, Kazuuls Fury, Port Razer, Souls Fire, Infantry Shield, Isengard Unleashed, Chandras Ignition, Essence Harvest, Self-Destruct, Pain for All, Soul Immolation, Muddle, the Ever-Changing As we see form the comparative analysis, the rates per category are very good

All non-basic land cards can be crafted using Wildcards of the appropriate rarity once Jumpstart is available in MTG Arena
That's just how much players and collectors alike value this card
At the beginning of your end step, create X 1/1 black Fungus creature tokens with This token cant block, where X is the number of times you descended this turn