When Ajani's Aid enters the battlefield, you may search your library and/or graveyard for a card named Ajani, Valiant Protector, reveal it, and put it into your hand
Ignore any timing restrictions based on the card's type
Each opponent gets a poison counter even if they can't sacrifice any permanents
When it's defeated, exile it, then cast it transformed.) When this Siege enters, create a Treasure token
This will likely make it so that one of the lands will be the same color as your commander's identity, which tends to be more useful than any color, and it is one of the best lands that allows for easy mana fixing in any deck
It is also another potential source of value as you are producing tokens of low importance