When Vilemaw's Battlefield effect is active (restricting movement to that battlefield), can Tideturner target a unit at base, and what happens when the effect resolves?

Ruling: You can target a unit at base with Tideturner even when Vilemaw's Battlefield effect is active. When the effect resolves, Tideturner stays at its current battlefield and the targeted unit moves in from base (only the targeted unit moves, not Tideturner).

Sequence:

• Target a unit you control at another location (can be at base even with Vilemaw active)
• On resolution: Tideturner remains at its current battlefield
• The targeted unit moves from base to Tideturner's battlefield

Nuances:

• Vilemaw's restriction only applies to movement to base, not targeting
• Tideturner is specifically mentioned in the FAQ as an exception to normal battlefield targeting rules
• The effect uses partial resolution rules since it has multiple instructions, so it can resolve even if one part cannot fully execute
• The only deterministically illegal activation would be using Tideturner when it's the only unit on your board