This is decent against 1/1 thopters and 2/2 zombies but there are increasingly 4/4 tokens kicking around, direct copy token too, all of which stand to make this a fairly good value removal spell
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This alternate way of phasing out is known as phasing out indirectly. An Aura, Equipment, or Fortification that phased out indirectly wont phase in by itself , but instead phases in along with the permanent its attached to
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Once Brotherhood Spy's ability has resolved, removing the legendary Assassin (or Assassins) you control from the battlefield or causing them to lose the legendary supertype or Assassin subtype won't cause Brotherhood Spy's ability to stop applying for that turn