Does Reinforce trigger LEGION abilities when revealing units, and how do cost reductions apply?

Ruling: Reinforce must fully resolve before the revealed unit is finalized on the chain, so the revealed unit would be the second card played, not the first. LEGION abilities do not trigger from Reinforce because the revealed unit is not the first card played that turn. Cost reductions (including LEGION cost reductions) apply when paying the cost to play the revealed unit.

Sequence:

• Play Reinforce (first card played)
• Reinforce resolves completely
• Revealed unit is finalized on the chain (second card played)
• LEGION abilities do not trigger since this is the second card
• Any cost reductions apply when paying to play the revealed unit

Nuances:

• The revealed unit counts as the second card played, so LEGION conditions requiring "first card played" are not met
• Cost reduction effects still apply normally when paying for the revealed unit