Bring back rdw

[Deeliser10]

{ball lightning} + {assault strobe}

[Queezle]

However if you are short on mountain mana you could use {Arc Runner} instead of {Ball Lightning}

[BlackJester]

{Ball Lightning} has trample, which makes it that much better with doublestrike.

[Deeliser10]

Two {mutagenic growths} plus the combo coukd be a game ender

[BlackJester]

Two {mutagenic growths} plus the combo coukd be a game ender

Or one {Virulent Swipe}. Though the growths have the advantage of Phyrexian mana.

[Deeliser10]

So with a round one swamp followed by a round 2 mountain could be a {dark ritual} into a {heartless summoning} with a {priest of urabrask} into a {ball lightning}  with 2 {mutagenic growths} for a round two kill?

[Deeliser10]

Or would {ball lightning} die before a chance to attack?

[BlackJester]

Or would {ball lightning} die before a chance to attack?

No, it would be able attack. That turn two kill would require a perfect hand of seven cards and the draw.  But impressive.

[cltrn81]

The {heartless summoning} would kill it before it could be pumped up tho wouldn't it?

[Drbusta50]

What if you added {Sundial of the Ifinite} then you wouldnt have to sacrifice right?

[BlackJester]

The {heartless summoning} would kill it before it could be pumped up tho wouldn't it?

Ack!  Right, I wasn't paying attention there.
And {Sundial of the Infinite} would only keep it until the end on the next turn, meaning the end of your opponent's turn.

[Deeliser10]

Mountain round 1 with one drop creature
Mountain round 2 sacrifice creature to {infernal plunge}.  Cast {ball lightning} with three mana.  {assault strobe} with other mountain.  Phyrexian mana {mutagenic growths} times two.  Possible round two 20 damage with trample.

Just needed to work out the kinks a little.  Should all be legal and effective

[BlackJester]

So with a round one swamp followed by a round 2 mountain could be a {dark ritual} into a {heartless summoning} with a {priest of urabrask} into a {ball lightning}  with 2 {mutagenic growths} for a round two kill?

Let's try this:

T1: {Mountain}
T2: {Swamp}, {Dark Ritual}, {Priest of Urabrask}, {Ball Lightening}, {Virulent Swipe}, {Mutagenic Growth} x 2.

[cltrn81]

Mountain round 1 with one drop creature
Mountain round 2 sacrifice creature to {infernal plunge}.  Cast {ball lightning} with three mana.  {assault strobe} with other mountain.  Phyrexian mana {mutagenic growths} times two.  Possible round two 20 damage with trample.

Just needed to work out the kinks a little.  Should all be legal and effective

Sounds like a winner to me.  I have a ball lightning / assault strobe deck as well but I took out the 1/1 goblin with haste for 1 mana to put in {hellspark elementals}.  I just may incorporate 4 {infernal plunge} and bring back the goblins who's name eludes me.  I use another neat combo in this deck {traitorous plunge} and {fling}, deal double dmg to them and kill their creature in the process. 

[Grexis]

That goblin's name is {raging goblin} he's my favorite