While it does have haste itself, youre rarely slamming this in unless its to take out a Planeswalker
Note that, as with all activated abilities that don't state otherwise, Gisa's works at instant speed as long as they dont have summoning sickness, which means you can spawn blockers during your opponents turn
Cycling (, Discard this card: Draw a card.) Legendary Artifact Protean Hydra This creature enters with X +1/+1 counters on it
The Tarrasque This card let D&D people down because they expected it to be harder to handle
All this is to say, while people with big Reserved List collections will lose some value if the foil loophole is reinstated on the Gaea's Cradles and Gilded Drakes of the world, the impact is likely overblown, as the most expensive cards on the Reserved List are expensive because they are extremely rare and collectible, not because they haven't been reprinted
That duel deck absolutely suppressed his price