Attempting to get a simple design out of what I suggested in Advance spying post. I like the fact that the bonus is so small that it might not be worth sending a creature out to "remove the defenses". Still this probably costs too much to put out and fortify. Lumithread Field infers that +0/+1 to all creatures you control costs and comes with a bonus. +0/+2 might be fine, though. That's not normally done at common, but it is a situational defense. Alternatively, and might be okay with this card.

Yeah. I had something very similar to the "remove attacking creature" in mind, I think that's a reasonable idea. I wasn't sure a mass-toughness boost (even +0/+1) was common, but I'd forgotten limithread field, which suggests the numbers can be tweaked into place. I think we want something like this.

­Parapet as well for an old-school example. One could site Veteran Armorsmith as well if they wanted.

Problem with this wording: the bonus isn't tied to the fortification being attached to a land at all.

It'd need to either say:

> As long as ~ is fortifying a land, creatures you control get +0/+1.

or somehow relate to the land, like

> Creatures you control that share a colour with mana fortified land could produce get +0/+1.

The latter is pretty horrible wording. (The former isn't exactly pretty either.)

Hmm... you're right. The first one may not be pretty, but I'm changing it to that for now to make sure it works. While we're on the subject of making it not pretty, but making it work, I took the opportunity to change it to "Defending creatures you control get +0/+2." That may not be common, but it probably needs to be tested. It also gives us a reason to increase costs, and the defending thingy is closer to flavor.