I don't use dexterity cards for my cube (It's also never come up as those cards are usually bad). Then again, this isn't as much a dexterity card as it is random dice of doom and boon all over the battlefield.
This seems kinda meh. Everything about it is random, and because it's dice I'm not even guaranteed to kill what I want to or to even pump. It would be extremely sucky if I paid X=2-3 and then the dice bounced off because the height is high enough for physics to come into play. If I do hit that's maybe pretty good, but again it's a dice roll. It would be sucky to roll this at an X/3 and have it be two or less, you cant afford to pay 1RG or more for a card that could do nothing, though at one you're probably going to at least land it where you want to.
I'm kinda against manual dexterity cards in general because inconsistency with awful floors is really unappealing, and for a guild card that's a major strike against it.
I'm still not sure if I exclude this card simply by principle yet.
On one hand, I don't use dexterity. On the other hand, I certainly allow for cards with random effects. This card honestly blurs the line between the two.
As far as the card's power, if X=1 you more or less get to pick where the card lands. Giving a creature you control 1-6 +1/+1 counters or dealing 1-6 damage to a creature seems like a pretty rad deal. And at high dice counts, you'll cause some chaos which is bound to be good for you.
1-3 inches really isn't that high, this could be super strong. Im still not a huge fan of the rolling, but if you can get past that this is probably a stellar RG aggro option. You either clear some amount of small creatures or buff your board presence, the options are pretty nice.