Fallaji Wayfarer is all colors. This ability doesn't affect its color identity. (It can be in any deck whose commander's color identity includes green.)
Multicolored spells you cast have convoke. (Your creatures can help cast those spells. Each creature you tap while casting a multicolored spell pays for {1} or one mana of a color that creature is.)
![Fallaji Wayfarer (Extended Art) [Dominaria United Commander]](http://paradoxtcg.com/cdn/shop/products/2ff82923-e230-5591-8cbe-cc9b3099a9f3_91733f0f-c239-465d-98c2-7f108fc17653.jpg?v=1703886665&width=1445)
