@rolko I agree about song of the dryads. I tested it as well and wasn’t a fan at all. It seemed really underwhelming at 3 mana and if they can’t counter it they can just remove it and continue on.
I do like spyglass, another card I think could be good here. It not only shuts off walkers but it’s also a card that can be used to shut off wastelands in certain matchups which can protect Dark Depths before you have a chance to make merit lage, which is a situation that comes up pretty often, and also shuts off storm pieces like bargain. The card has a lot of value.
I’ve had academy ruins in past builds and I think it’s a card that could certainly merit a spot in a 75 that has a lot of artifact hate. It recurs cards like Rod and Spyglass over and over and reduces a blue control opponents value to countering the spell or saves it from the grave if it gets blown up or pitched to Bazaar.