If Riptide Rex targets a 6 might unit with his ability, and the opponent responds by using Tideturner to swap that unit to another battlefield, does Riptide Rex's damage still hit the targeted unit?

Ruling: Yes, Riptide Rex's ability still deals 6 damage to the targeted 6 might unit even after Tideturner swaps its location.

Nuances:

• Abilities track their targets even when the target moves to a different battlefield
• The location swap does not cause the target to become invalid