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PSoul of Migration
Soul of Migration
Creature — ElementalMH2common
Flying
When this creature enters, create two 1/1 white Bird creature tokens with flying.
Evoke 
(You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)
2/4
Rulings2
2021-06-18If you pay the evoke cost, you can have the creature's own triggered ability resolve before the evoke triggered ability. You can cast spells after that ability resolves but before you have to sacrifice the creature.
2021-06-18To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as an evoke cost), add any cost increases, then apply any cost reductions. The mana value of the spell is determined by only its mana cost, no matter what the total cost to cast that spell was.