AsmoRepeat cost on abandoned hall
When you play spell and repeat it, do you get +2 might on abandoned hall?

When a player plays a spell, they may give a unit they control here +1 this turn.
Artist: Envar Studio
Card Set: Unleashed
AsmoWhen you play spell and repeat it, do you get +2 might on abandoned hall?
I control Arena's Greatest with one unit and hidden Tideturner. I Ride the Wind my unit to Abandoned Hall. At which point do I lose control? Can I react to Abandoned Hall's trigger with Tideturner to swap with the unit now at Abandoned Hall?
You have two units at Abandoned Hall and Ride the Wind one away. Hall would trigger after Ride resolves, but the moved unit is no longer there. Does Abandoned Hall trigger when a unit moves into it via Ride the Wind, even if that unit was not there when the trigger resolves?
Irelia, Fervent moves to attack Abandoned Hall. I cast On Guard on her and also use my legend ability. Is Fervent a passive, or does each spell resolution put separate Fervent triggers on the chain?
Source: Unleashed Rules FAQ and Clarifications Abandoned Hall has a battlefield triggered ability where a specific player makes choices. Who controls that ability?