When Student (1 might) enters the battlefield and Cleave is played, then opponent plays Smoke Screen, does the unit go to -4 might or stay at minimum 1 might, and how does this affect Cleave's +3 might bonus?

Ruling: Smoke Screen reduces the unit to minimum 1 might (not -4). Cleave's +3 might bonus is then applied along with the snapshotted -1 modifier from Smoke Screen.

Sequence:

• Student starts at 1 might (base) + 1 (trigger)
• Smoke Screen applies -1 (bringing it to minimum, not below)
• Cleave resolves: 2 (current) + 3 (assault bonus) - 1 (snapshotted Smoke Screen modifier) = 4 total
• If Student trigger resolves after: 2 + 1 (trigger) + 3 (assault) - 1 (Smoke Screen) = 5 total

Nuances:

• Smoke Screen's modifier is snapshotted, so the -1 continues to apply even after other modifiers are added
• Assault from Cleave only applies if moving to an opponent-controlled battlefield