If my buddy casts Shivan Fire in response to me casting the Siege-Gang Commander (with Goblin Trashmaster already in the field which already gives every other goblin +1/+1) can he kill the Siege-Gang mid air before it hits the field or does the Siege-Gang already have the +1/+1 bonus making it null?
A "creature" without any other descriptor means a "creature permanent", which can only exist on the battlefield. So Shivan Fire cannot target the Siege-Gang commanderspell on the Stack. And since continuous effects apply right away, when the Commander spell resolves and it enters the battlefield, it does so with the bonus to power/toughness already applied. So no, an unkicked Shivan Fire won't be able to kill the Commander in this scenario.
Shivan Fire can only target a creature. A "creature" means a permanent on the battlefield with the Creature card type.
While on the Stack (what you appear to mean with "mid air"), Siege-Gang Commander is a Creature Spell and can't be targeted by Shivan Fire (and in general, spells can't receive damage). You need to wait until Commander enters the battlefield, and at this point it will already have Goblin Trashmaster's +1/+1, because it is a static ability, so it can't be killed with just 2 damage.
Thanks.
Siege-Gang Commander
Goblin Trashmaster
A "creature" without any other descriptor means a "creature permanent", which can only exist on the battlefield. So Shivan Fire cannot target the Siege-Gang commander spell on the Stack. And since continuous effects apply right away, when the Commander spell resolves and it enters the battlefield, it does so with the bonus to power/toughness already applied. So no, an unkicked Shivan Fire won't be able to kill the Commander in this scenario.
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While on the Stack (what you appear to mean with "mid air"), Siege-Gang Commander is a Creature Spell and can't be targeted by Shivan Fire (and in general, spells can't receive damage). You need to wait until Commander enters the battlefield, and at this point it will already have Goblin Trashmaster's +1/+1, because it is a static ability, so it can't be killed with just 2 damage.
lol jk - gg thanks guys.