Invasion of Tarkir and discarding the revealed card
Invasion of Tarkir should lock in the damage value after revealing the cards, but as it is, if you discard a revealed card in response to the reflexive trigger (perhaps due to Graveyard Trespasser's ward cost), the revealed card does not count towards the damage.

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[Deleted User] commented
"i loss two of my games in a remier draft khans event because of that Invasion of Tarkir should lock in the damage value after revealing the cards, but as it is, if you discard a revealed card in response to the reflexive trigger (perhaps due to Graveyard Trespasser's ward cost), the revealed card does not count towards the damage. would you refound my money??"
Let me get this straight. You're saying you lost a Khans of Tarkir draft because a card from the set March of the Machine decreased in power because of a card from the set Innistrad: Midnight Hunt so you want a refund.
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H2Otor#01607 commented
I just lost a sealed (1-2) due to a bug in Khans of Tarkir. The morp ability from Horde Ambusher didn't work...
When you lose due to bugs is extremely frustrating. -
BOLTXEVIKE#86662 commented
i loss two of my games in a remier draft khans event because of that Invasion of Tarkir should lock in the damage value after revealing the cards, but as it is, if you discard a revealed card in response to the reflexive trigger (perhaps due to Graveyard Trespasser's ward cost), the revealed card does not count towards the damage. would you refound my money??