Mana (Lands & Ramp) By far most important part of any deckbuilding checklist is making sure your deck has enough mana -- lands and ramp
Great in heroic and Feather stuff
Card draw and mana ramp are both readily accessible with this planeswalker in your command zone, and as cards like Soul of Windgrace and Wrenn and Six have joined favorites like The Gitrog Monster and fetchlands, the strategy has become incredibly potent and consistent over time
3 Chaos, the Endless Garland, Knight of Cornelia Kuja, Genome Sorcerer Trance Kuja, Fate Defied
Standard only uses two different strong dual land cycles per year, and some more budget options like Gates and gain lands, but with only two years' worth of cards, there just aren't many options