Migratory Route is essentially better with the basic landcycling outside of a five color domain deck
This gives you less reason to keep the Plains because you want a density of threats to fight through a slower deck, and the game is also more likely to get to a point where you naturally draw seven lands over time
//// Aang and La, Ocean's Fury Legendary Creature Avatar Spirit Ally 5/5 Reach, trample Whenever Aang and La attack, put a +1/+1 counter on each tapped creature you control
It seems like a lot of steps to get, at most, five mana, which makes the justification for the high price rather hard to make
Alongside the regular versions, well be seeing two styles
While Valley Questcaller isn't a bird, it makes a fine lord