You can use Wonder Garage as a monster to be summoned by Magical Hats. It will then either be destroyed by your opponent attacking into it or during the End Phase because of Magical Hat's effect. Either way you will be able to use Wonder Garage's special summoning effect.
Activates if destroyed while Set / Activates from your Graveyard
I wish maybe if it just special summoned by activating but it would still be bad. should've at least summoned from deck wit this condition, bu then they would've put a clause by your opponent's card effect.