While he doesn't have any evasion or activated abilities to speak of, he does have one replacement effect that makes him very, very powerful: if a creature attacking triggers a permanent you control, the trigger is doubled
Quite simply, Windriddle Palaces is the most fun you are going to have in a plane, and I havent had any card stick more often than it, because its essentially fair, interesting, and intriguing
Furthermore, its attack also makes the opponent discard one energy card from their active Pokmon, meaning that it can occasionally make the opponent unable to attack on the following turn
At a Regional Championship Qualifier, I once won a game by casting two of these on the opponents end step while they had 10 life a fitting anecdote for keeping in mind what burn spells can be capable of in their best moments