When using Yasuo's legend effect to move a unit (like MF) and also moving a non-exhausted unit from base, do they attack at the same time or does the Yasuo-moved unit attack first?

Ruling: You cannot move a unit via standard move and via an ability at the same time, so the units cannot contest a battlefield together in this scenario.

Nuances:

• Moving a unit through Yasuo's ability and moving a unit through standard movement are separate actions that cannot be combined to have units arrive at the same battlefield simultaneously