Transmogrant Altar
The Transmogrant Altar card says: That a creature can be sacrificed to create a colorless 3/3 zombie and can be activated as a spell.
The God King player activated the use of the card in the middle of the attack as an instant, I lost the game because he unfairly used a card that could not be used at that moment.
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Rezzahan#77802 commented
The token making ability has the sorcery timing restriction. But, the mana ability that lets him sac a creature to get 3 mana has no such restriction. In fact, being a mana ability, it can even be used when paying for attacker declaration, paying for spells or abilities, or paying for spells/abilities that demand a mana payment. AND, as a mana ability, it doesn't use the stack and cannot be responded to.