Some are appearing for the first time in the retro frame, and some have been here before, but they're all ready to slot in your favorite deck
Any deck with the ability to pump out Thopters can use this card to cruise to an early victory Related Guardian Project A card with so-so viability in Standard that is an obscene powerhouse in singleton formats like Commander
cards (with some exceptions, such as "Different Dimension Dragon")
People start spending too much money on that asset, and when it turns out to be worthless, the price collapses
For more information on double-faced cards, checklist cards, delirium, madness, and skulk, please see the Shadows over Innistrad Release Notes
I like Blight Herder as a cheaper but potentially strong midgame creature that brings along an army in a can similar to powerful creatures in the past like Siege-Gang Commander and Cloudgoat Ranger