If I use Ride The Wind to move a unit to Abandoned Hall, will I be able to give the unit that moved the plus one Might?

To determine if you can give a unit +1 [M] (Might) when moving it to Abandoned Hall using Ride the Wind, we must look at the timing of the trigger and the resolution of the spell.

Ruling

No, you cannot give the unit +1 [M] using the ability of Abandoned Hall in this scenario.

Reasoning

The ability on Abandoned Hall is a triggered ability: "When a player plays a spell, they may give a unit they control here +1 [M] this turn."

1. Trigger Timing: Triggered abilities that occur when a card is played are placed on the chain as soon as the spell is finalized.
2. The Sequence:
   • You play Ride the Wind (a spell).
   • The ability of Abandoned Hall triggers because a spell was played.
   • The trigger is placed on the chain. At this moment, the unit you intend to move is not yet at the Abandoned Hall.
   • The chain resolves (LIFO). If you choose to resolve the Abandoned Hall trigger first, you must choose a target unit currently at the Abandoned Hall. Since your unit has not moved yet, it is not a legal target for the hall's ability.
   • If you resolve Ride the Wind first, the unit moves to the Abandoned Hall, but the trigger for the hall's ability has already been placed on the chain and its targeting/choices were locked in or resolved before the unit arrived.

Sequence of Events

1. Play Spell: You play Ride the Wind.
2. Trigger: The Abandoned Hall ability triggers ("When a player plays a spell...").
3. Chain State: The chain now contains: [Abandoned Hall trigger] -> [Ride the Wind].
4. Resolution:
   • The Abandoned Hall trigger resolves. You must choose a unit you control at the Abandoned Hall to receive the +1 [M]. Since your unit is not yet there, you cannot choose it.
   • Ride the Wind resolves. You move your unit to the Abandoned Hall.
5. Conclusion: Because the trigger condition ("When a player plays a spell") was met and the ability resolved before the unit arrived at the battlefield, the unit cannot benefit from that specific trigger.

Note: I could not fully verify this ruling against the retrieved rules.