There are two cards here - "Seize the Initiative" and "Deceit". Wordings:
Seize the Initiative - "Play this card at the beginning of any round, before rolling for Priority. You immediately take Priority this turn without any dice being rolled."
Deceit - "Play this gang tactic during the Priority phase of any round, after Roll for Priority, but before Ready Fighters. You may immediately reverse the results of the Priority roll. In other words, you may choose to take Priority if your opponent won the roll or you may choose to give your opponent Priority if you won the roll."
The situation - the beginning of a new round, the initiative phase. Before rolling the dices, Player A uses "Seize the Initiative". Player B wants to use "Deceit" to take priority for himself and cancel the effect of the first card. Can player B do it?
Seize the Initiative - "Play this card at the beginning of any round, before rolling for Priority. You immediately take Priority this turn without any dice being rolled."
Deceit - "Play this gang tactic during the Priority phase of any round, after Roll for Priority, but before Ready Fighters. You may immediately reverse the results of the Priority roll. In other words, you may choose to take Priority if your opponent won the roll or you may choose to give your opponent Priority if you won the roll."
The situation - the beginning of a new round, the initiative phase. Before rolling the dices, Player A uses "Seize the Initiative". Player B wants to use "Deceit" to take priority for himself and cancel the effect of the first card. Can player B do it?