Which promo cards are permitted in Constructed tournaments?
[Source: WotC] 
My opponent has Nightbird in Alt mode with 9 damage counters on her. If I play
Plasma Burst to deal the remaining two damage to finish her off, will I still have to deal 1 damage to one of my characters?
[Source: WotC]
Yes. Unless the game ends when Nightbird is KO’d.
If Nightbird attacks with a
Contract Contingency and it triggers Nightbird’s bounty, can I take another Contract Contingency from my opponent’s scrap pile, play this, then trigger Nightbird’s bounty again?
Or can you only trigger Contract Contingency once because you are not getting 4 or more attack damage through after applying the plus 2 to the already finished attack?
[Source: WotC]
The second
Contract Contingency won’t trigger because it will be played after the attack damage has been done.
Shockwave’s ability will trigger a total of 8 times. Each of those abilities resolves separately, so essentially you have 8 damage counters to spread around as you wish.
Using the previous scenario, my character is Nightbird in alt mode. What is the timing there? Does the
Decepticon Shockwave player take 1 damage each time an action hits the play area or after the
Brainstorm resolves?
I.E. My Nightbird is at full HP (11) and his Shockwave is at 3. Who wins?
[Source: WotC]
Here's what happens. Your opponent starts to play
Brainstorm, this causes Nightbird’s ability to trigger, but that effect doesn’t resolve immediately. Continuing to resolve Brainstorm, your opponent then plays
System Reboot. Another Nightbird trigger happens, which, again, doesn’t resolve immediately. The System Reboot resolves, causing Shockwave to trigger four times. Continuing to resolve Brain Storm, your opponent then plays the second System Reboot. This causes another Nightbird trigger. The second System Reboot causes another four Shockwave triggers. Now that Brainstorm has resolved, we start resolving triggers, beginning with the ones that triggered most recently and working backwards. The four Shockwave triggers caused by the second System Reboot happen one at a time. Next, the Nightbird trigger caused by the second System Reboot happens. Next, the Shockwave triggers caused by the first System Reboot happens. Next, the Nightbird trigger caused by the first System Reboot happens. And finally, the Nightbird trigger caused by the Brain Storm happens. At any point, if resolving one of these triggers causes a player to KO their last character, that player loses the game. If Shockwave was at 3 and Nightbird was at 8 at the beginning of this sequence, Nightbird is going to lose.
Nightbird stealing cards from an opponent's scrap pile: Can I keep them after playing them?
[Source: WotC]
No. Any action you play from your opponent’s scrap pile goes into your played area, and eventually back to their scrap pile. (Cards always go to their owner’s hand, deck, KO area, and scrap pile).
If you attack with Nightbird and use her bounty ability, can you use steamroll from the opponent's scrap pile?
[Source: Aequitas]
You can play the
Steamroll, however you cannot use it for Nightbird's attack as by the time Steamroll is played, Nightbird's damage was already applied and the defender was already KO'd. If you happen to attack again on that same turn, Steamroll could be usefully applied to an attacker.
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