Blue Fog

[SpencerForHire]

Dopplegang- 3U
Instant
As an additional cost for Dopplegang, remove a creature you control from the game until end of turn.
Dopplegang Army can only be played during the combat phase.
Create a copy of target creature an opponent controls, this creature is unnaffected by summoning sickness.
At the end of turn sacrifice all copies created in this way.

What do you think?  It reminds me of clone but without the lack of surprise factor, this thing is a huge combat trick, from protecting creatures during combat to the fact it reminds me of defensive ninjitsu.

[Nefarias]

First, I'll try to reword this, as it's a bit confusing as is. For example, you use a different card name in the rules text.

Doppelgang
3U
Instant
As an additional cost to play Doppelgang, remove target creature you control from the game. Return that creature to play at the end of turn.
Play Doppelgang only during combat.
Put a creature token into play that is a copy of target creature an opponent controls. That creature token has haste. Sacrifice it at the end of turn.

If that is different from what you intended, I'm sorry.

A few things. First, it kills Legends. Second, for purely aggressive means, Ray of Command is better, but this definitely does more. On defense, you can play it after damage is one the stack, but it'd be better to play it before, and block the creature you copied, presumably one-for-oning it.

That said, take a look at Shifty Doppelganger and see if that's not what you're looking for.

[Matt]

This reminds me of Shattered Mirror.

EDIT: Which is a good trick, seeing as no such card exists. I was thinking of Broken Visage.