Another way to make re-fortifying relevant.

Repeatable damage at common is obviously dangerous, but Flame Jab says its possible if the cost is a land. This does 2 damage, but only to some creatures, only once per turn, and at the cost of a land drop as well as a land card.

I chose "target attacking creature" to fit the "mined" flavour, but it's probably a good thing because it means you can't re-fortify and re-use it immediately.

Hmm. Quicksand was common, but it made quite a difference just having one untapped across the table; a few attacks were made just to "use up" the Quicksand. If it could come back with a re-attach that'd be even more oppressive.

This might also have a subtler trap: the controller might use the ability more than is wise, and effectively mana-screw themselves. I'm not sure if that's an issue we should be trying to avoid or not.

But with all that said, I think this certainly could work, perhaps even at common. One knob we could twist to make this less oppressive would be to bring the damage down from 2 to 1.

(I think the activation ought to be something like ", Sacrificed fortified land", or perhaps 'Fortified land has ", , Sacrifice this land:"', but those details can come later.)

Perhaps damage to flying attacking creatures? I was going to suggest 'non-flying' like usual, but this set has a flying hate theme going on, and I'm not sure whether we should be supporting that, or give a general gimme to the gold side. Further restricting the creatures it hits, however, reduces the chance of someone killing themselves with this.

Again, I like the flavor in this. Enforcing the attacking restriction does a good job of making these lands 'active'.

I like the idea of restricting it to flyers as well.

I think the existence of Fortifications like this (ones with a "sacrifice fortified land" ability that needs to be used at instant speed) is a great recommendation for having some black cards that can move Fortifications around at instant speed, like analogues of Brass Squire.

Jack didn't put a cost or activation on this. I added some rather steep costs, since this is reusable, potentially hidden and complicates attack steps, as well as encourages players to waste their resources and it's common. You know, I really want to defend the common status of this card, but there are just too many things that scream 'Alert! This should be Uncommon!' on the card.

The card does have one more shot at being a common in the set. I do like the idea of having a fortification that sacrifices itself and the land it is fortifying to destroy an attacking flying creature. Sky-Mine go boom... no re-usability, and the cards stats can go back to a normal number as well. Anybody else for this, or were people eager to play this as is, and want it bumped to Uncommon? (Or perhaps there's room for both ideas. There probably is...)

No response, so I made Dispersal Cannon.

I definitely agree this is too game-altering for common. I prefer Dispersal Cannon as the common.