Might need to swap this with the black one.

I suspect the rules don't like this unless you gain control of the target UEOT.

Was: Target attacking creature blocks another attacking creature of your choice.

This is much more sensible. But it should probably cost 3. In fact, each half of this costs 3 on its own; possibly should either cost 4 or be a sorcery costing 3. See Rebuke and Neck Snap/Divine Verdict. Terashi's Verdict and Puncturing Light show that for you get less than Rebuke. Vengeance is rather overpriced for the other half - Assassinate or Death Stroke are more normal pricings for it.

Really? Yow. And here I'm thinking "It's like a one-use royal assassin".

Maybe if I gave it something like swords-to-ploughshares drawback?

You'll note that Assassinate was named to make that reference (it was originally printed in Time Spiral, where pretty much every card referenced an older card).

But, yeah, removal is good in limited; removal generally only gets to be 2 of the 3 of versatile, cheap and common. (Where "cheap" means "2 mana or less".)

I detect a reference to the Star Wars mythos. Perhaps this card should also destroy all knights...

Can I make this 'or artifact' ?

Also, yeah, needs a better name.

Ah, dammit - making this kill tapped artifacts won't let it kill the equipment, which makes it pretty much usless in set anyway, since all the other artifacts sac.

You could probably have "Choose one - destroy target artifact; destroy target attacking creature; or destroy target tapped creature." That'd need to cost if not , though.

It's nicely versatile though - I think I'd probably run it in a lot of white decks.

Yes, very. I mean, that's fine; there are a variety of good utility spells. I guess it's like Iona's Judgment, which cost 5 and was a sorcery.

Actually, you know what? With the "tapped" option, the "attacking" one doesn't add much; only really the ability to hit vigilant guys and avoid getting countered by untap tricks. So "target artifact or tapped creature" would do. (And would probably still have to cost 4 or 5.)

Mmm. Not thrilled by removal that costs that much, though.

How about with controller of the target getting lifegain? Can that bring it down to 3 again?

If you drop the artifact hit as well. It'd probably still need to be 4 if it's hitting artifacts or creatures. See Last Breath, which was only creatures, very restricted on power, and still gave the opponent life.

Ok, I'm thinking...

­ - Sorcery - Destroy target artifact or tapped creature, it's controller gains life equal to its CMC.

Brings back the "You have to get hit by it" part; a shame I can't hit it when it attacks (which is kinda white's thing) but it does power it down quite a lot.

And it feels REALLY odd to not hit enchantments too; but there's only actually 2 enchantments in the set.

Now if it hit enchantments, artifacts and tapped creatures, that would be a utility spell I'd want 4 of in every deck. Like Oblivion Ring and Faith's Fetters.

Ok - this seems like the obvious card to extend my "You may cast this by discarding an untapped (plains)" cycle. Make it "Tapped creature" add that and done?