Mogg Bombers

[ELD]

Without the intervening "if you do" clause, I don't see why this wouldn't trigger and resolve multiple times if multiple creates enter the battlefield at the same time.  Can someone clarify this for me?

Card Name:
Mogg Bombers
Mana Cost:
3Red
Converted Mana Cost:
4

Types:
Creature — Goblin
Card Text:
When another creature enters the battlefield, sacrifice Mogg Bombers and it deals 3 damage to target player.
Flavor Text:
Behind every great mogg bomber is another mogg with a shovel and a basket.
P/T:
3 / 4

The first thought was it's synergy with Siege-Gang Commander.

Card Name:
Siege-Gang Commander
Mana Cost:
3RedRed
Converted Mana Cost:
5

Types:
Creature — Goblin
Card Text:
When Siege-Gang Commander enters the battlefield, put three 1/1 red Goblin creature tokens onto the battlefield.
1Red, Sacrifice a Goblin: Siege-Gang Commander deals 2 damage to target creature or player.
P/T:
2 / 2

I believe it would work as follows.  Siege-Gang Commander would enter the battlefield, and there would be two triggers.  I'd place them on the stack, with Bomber's trigger below the Siege-Gang token trigger.  The token trigger would resolve, triggering 3 more Bomber triggers.  The last added Bombers trigger would resolve, resulting in Mogg Bombers being sacrificed, and doing 3 damage to target player.  Then the remaining triggers would resolve.  With no Bomber to sac each time, the 3 damage would be assigned for each trigger.  For added juice, you could cast a Siege-Gang, and vial in another one.  This would also play well with Mogg War-Marshall. 

[H]

I think that there was supposed to be errata to add an intervening "If" clause there, but it seems that somehow it was removed.  See the "Rulings" from Gatherer:

10/4/2004    The Mogg Bombers do trigger on any creatures that enter the battlefield at the same time they do.
10/4/2004    If multiple creatures enters the battlefield as the result of a single spell or ability, then it will trigger multiple times, but due to the errata, only the first resolution will do 3 damage. The other triggers will do nothing.
10/4/2004    The "if you do" only happens if you successfully sacrifice this card. So it still has to be on the battlefield when the trigger resolves in order to deal damage.

You can find the errated version here: http://web.archive.org/web/20091011044330/http://gatherer.wizards.com/Pages/Card/Details.aspx?name=Mogg+Bombers

I have no idea if this was done on purpose or by accident.  But, until someone goes and fixes that, your combo absolutely works.  Maybe someone was being cagey durring the M10 rule updates?  All I can tell you is that at some point after July 11th 2010, the errata got dropped and the old wording (with the battlefield terminology) was restored.

[Clariax]

The 2nd and 3rd rulings in Gatherer for Mogg Bombers are not correct and in need of being removed.  The oracle text does not contain any intervening "if" clause.  It did at one point but was likely changed later to make it closer to the printed text.