When playing Reinforce and finding both Blitzcrank and Nocturne, does Nocturne get played before Blitzcrank pulls an enemy, resulting in Nocturne participating in the combat triggered by Blitzcrank's pull?

Ruling: Yes, Nocturne is played and resolves to the battlefield before Blitzcrank's pull ability triggers, so Nocturne participates in the combat initiated by Blitzcrank's pull.

Sequence:

• Reinforce reveals cards and sees Nocturne, who is banished and played to the chain as a pending item
• Choose Blitzcrank from the remaining cards and play him to the chain as a pending item
• Recycle remaining cards and Reinforce resolves
• Finalize Nocturne first (oldest item on chain) - he resolves to the chosen battlefield
• Finalize Blitzcrank next - he resolves to the battlefield, triggering his When You Play Me ability
• Blitzcrank's WYPM goes on the chain and resolves, pulling the enemy unit to the battlefield
• Combat occurs with Nocturne, Blitzcrank, and any other units already there versus the pulled enemy

Nuances:

• The chain is a public zone, so cards added to it are face up and visible to all players
• Nocturne uses cost replacement (Universal Power instead of base cost) while Blitzcrank uses cost reduction
• Players have a chance to play reactions after Blitzcrank's WYPM is finalized but before it resolves