If I used Discipline on my unit and my opponent reacts with Star-Crossed, does my Discipline still let me draw?

Yes, you still draw from Discipline even though your opponent reacted with Star-Crossed.

Why this happens

According to the Chain Rules and Core Rules 359.3.e, Riftbound spells resolve as much as possible even if their target is removed or becomes illegal while the spell is on the chain.

Sequence of Events:

1. You play Discipline: You target your unit. Discipline goes on the chain.
2. Opponent plays Star-Crossed: They add Star-Crossed to the top of the chain, targeting your unit (the friendly unit for them) and an enemy unit.
3. Chain Resolution (LIFO - Last-In, First-Out):
   • Star-Crossed resolves first: It returns your unit and the enemy unit to their owners' hands.
   • Discipline resolves second: Because Discipline does not have a "targeting" dependency for drawing the card (the draw is not contingent on the unit successfully receiving the +2 might), it still resolves. Your unit is no longer on the board to receive the +2 Might (which is ignored), but you still draw 1 card.

Important Nuance

As noted in RiftJudge FAQ #7790 and #2078, if a spell contains multiple instructions, non-conditional parts (like "Draw 1") always happen unless the spell is countered. Even if a target becomes invalid, the spell "whiffs" on that specific portion but proceeds to resolve the remaining instructions.