Aggress - new keyword ability

[orgcandman]

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502.50
Aggress

502.50a
Aggress is a triggered ability that triggers during the Declare Attackers Step. (See rule 308, "Declare Attackers Step"). "Aggress" means "Whenever attackers are declared, this creature may be declared as an attacker."

502.50b
A creature declared as an attacker this way may be assigned blockers by the defending player during the "Declare Blockers Step"

502.50c
Aggress modifies combat rules...

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The premise: I can attack on my opponents turn, whenever he declares attackers. His attackers will be attacking me, and my attacker(s) will be attacking him. We declare blockers, etc..

I'm not quite sure how to correctly word this into the game so that it correctly modifies sections 308, 309, and 310. A better rules guru will have to help.

I see this as primarily a W and R ability.

The basic d00d with aggress:
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Block Me Plz        -        1WR
Creature - Warrior
Aggress
2/1
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[Anusien]

I'm not even sure this would work, but I definitely wouldn't post a rules snippet as if it were from the CR, since those numbers can change at any date.

Can you talk a little bit more about why you want to do this, what benefits you think it has?  I mean, it messes with something pretty fundamental, and I'd like to hear your thoughts on why that's good.

Also, you realize that this guy can attack while tapped, Pacifismed, etc, right?  (I think, would have to double check).

[Harlequin]

I think better acknowledgement of what exactly this does is needed. 

1) It allows the creature to attack or block while tapped.
2) it allows the creature to bipass normal summoning sickeness requirements as well as Pascifism effects
3) It allows a creature to attack and block in the same round, so its vigilance-esque.

So its actually really really powerful.  To make this a more versitile keyword I would add a cost.  Keeping in mind that the cost on a spesific creature like the 2/1 you propose the cost could be or some other non-mana cost (like discarding a card or paying life).

Now look at provoke.  Provoke untaps a target creature and forces it to block.  It could (in terms of rules) not have the creature untap, but for clearity and general sense-making it untaps the provoked creature. 

Forcing the creature into combat adds additional rule bagage, and questionable interactions Pascifism, Propaganda, Silent Arbitor, etc ... would all have to be address and evaluated.  Also say, if I attack with a single creature with pro-red and you Aggress a red creature ... can it block?

Proposal:

Aggress [cost]

At the begining of combat you may pay the Aggress Cost, if you do untap this creature, it gains Haste and must attack or block this turn if able. 
At the end of combat if the Aggress cost was paid this turn, tap this creature.

Ok so its got a few differances like for example, if you have something like Whipcorder (tap target creature) it would still work as a valid answer to Aggress.  Also ability that prevent creatures for attacking or blocking will still prevent Aggress.  Also it could have negative synergy with something like Vigilance... but I think the re-tapping is nessisary if not only for multiplayer (where vigilance is stronger than normal). 

It also adds the ability to use a ability multiple times in a round.  You could theoretically, use the in the first main, then again durring pre-combat (meaning it wouldn't attack), and then AGAIN use the durring your oppoent's turn after thier pre-combat.  So giving Aggress to a creature with a built in ability is probably not smart.  However, allowing this to mini-combo with a card like Quicksilver Dagger or Fire Whip is probably fine.

[Norm4eva]

I'm pretty sure this changes SO many rules of combat that it's probably a bit nightmarish.
First of all, attackers/blockers have classically all been declared simultaneously during the proper step of the combat phase.  If both AP and IAP are declaring attackers and blockers, that pretty much adds another couple of steps to the combat phase which is already the most complex aspect of the game when it comes to correct priority passing, etc.
Then, since combat damage is assigned all at once, Aggress seems to lend itself to the occasional tie game.  Someone does the math wrong and alphas only to 'lose' to random aggress guy that gets Aether Vial'd in.  Kind of dumb.
I think this could make an interesting drawback for a creature, if worded slightly differently...

Impatient Ogre
G

Creature - Ogre

Aggress - Impatient Ogre must attack or block each turn if able.  If it does, untap it after combat.

"Bullocks 'n' fudge!  Where's the fight?!"
3/2

It's kind of huge.  But it also HAS to block that White Knight when it comes over, and will be swiftly taken down.