I'm at a Dreaming Tree with a unit. I play en garde on the unit. My opponent reacts with Defy. Do I draw because of the Dreaming Tree before or after Defy resolves?

Yes, you will draw a card from The Dreaming Tree before Defy resolves.

According to the established rulings for The Dreaming Tree, the battlefield's draw effect triggers the moment you target your unit with a spell, placing the draw trigger on the chain above the spell you just played.

Here is the sequence of events:

1. You play En Garde targeting your friendly unit at The Dreaming Tree.
2. The Dreaming Tree triggers immediately because you targeted a friendly unit. This trigger is placed on the chain above En Garde.
   • Chain state: En Garde (bottom) > The Dreaming Tree draw trigger (top)
3. Your opponent plays Defy targeting your En Garde. This is placed on the chain above the draw trigger.
   • Chain state: En Garde (bottom) > The Dreaming Tree draw trigger > Defy (top)
4. Resolution (LIFO - Last-In, First-Out):
   • Defy resolves first, countering your En Garde.
   • The Dreaming Tree trigger resolves next, and you draw your card.

Because the draw trigger is added to the chain the moment the spell is played (targeting the unit), it remains on the chain and resolves regardless of whether the original spell is countered by Defy.