At first glance, this card is a solid addition to asset-heavy identities like Gagarin Deep Space and Industrial Genomics. It's essentially a PAD Campaign turned on by the presence of a rezzed asset. Any deck that loves assets will generally love this card - but in looking at what assets to pair with this, we might find a surprising depth of choice.
Take the aforementioned PAD Campaign, for example. Like many assets, it tends to sit out in a remote all on its own, gradually building revenue for the corporation. There's not much harm in putting an Expo Grid alongside this - chances are you weren't going to put any other upgrade in that server in the first place. The end result is a remote earning you 2c/turn for a 2c + 2 card investment - which isn't bad, considering the relative rarity of cards like Singularity, and that Imp will only solve half the runner's trashing conundrum on its own.
Other assets that aren't straight drip economy gain added impetus when run beside the grid. Jackson Howard is one such card. He's a trash-on-sight for many runners in several matchups, where they end up fearing recursion of cards like Caprice Nisei, or his added draw speeding an Astrotrain. This fear is relaxed somewhat against Weyland IDs - especially in the early game, where the runner is too busy setting up their rig to care. Add in having to navigate Gagarin's Paywall Implementation and ability tax just to touch him, and their reluctance is understandable. This apathy has a bit more sting to it, though, when the Expo Grid is making him pull double duty as a PAD Campaign.
This works for more niche cards, too. Maybe Elizabeth Mills just finished handling the fallout from your recent Hostile Takeover and wants something to do before burning down the runner's house later in the evening. Same for Mark Yale, or an Executive Boot Camp in recess: instead of wasting away in a remote after serving their purpose, they can staff the grid and earn some sweet company dollar.
Better yet, consider more high-priority assets, like an Adonis Campaign, potentially backed by one or more Hostile Infrastructures, which in turn may be buffered by a dense series of Encryption Protocols. You can pin any of these to your Expo Grid - but all of them will hurt to trash. Any targeted snipe to disable the grid itself will feel like a minor victory, at best.
Since you're required to access all cards in a remote, this works for traps, too, which can get downright comical. An Expo Grid alongside an exposed Snare! is basically an exploding PAD. Does the runner feel like zapping themselves to trash it? If that rezzed Snare! is powering up a line of Tour Guides over R&D, maybe. A triple advanced Junebug, in comparison, is a pretty ironclad deal - one that serves as an explosive GRNDL Refinery if you liquidate it via company Back Channels. This combo will probably win you more weird looks than it will games, but the concept illustrates Expo Grid's flexibility fairly well - something that will only improve as more potentially-threatening assets are released down the line.