I had Gas Guzzler and Rot-Curse Rakshasa on board, with 3 speed. I attacked with Rakshasa uncontested. After dealing damage to the opponent, my speed was maxed. Rakshasa has Decayed, which causes it to be sacrificed at the end of combat. The game automatically passed to end of combat, instead of giving me priority to sacrifice the Rakshasa with Gas Guzzler's ability. I verified that the game has the capability of allowing such a play if full control is enabled, but I believe it should not be required.