Creature gaining haste is still able to activate after losing haste on a turn it is summoning sick
This specific example is for Hellspur Posse Boss and Deadeye Duelist, unsure if it is a bug with other similar combinations.
Steps:
Have Hellspur Posse Boss and Deadeye Duelist, with Duelist having just entered the battlefield and being summoning sick.
Destroy Hellspur Posse Boss.
Actual Result: Deadeye Duelist can be activated any time during that turn.
Expected Result: Deadeye Duelist loses haste and cannot be activated.
4
votes

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Mikail#08317 commented
This still occurs
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Benimal#67569 commented
Exactly the same happened in my game as well.