Unable to Agree, Aura

【AUTO】 [Put 1 "Cold-Blooded Pursuer, Shalltear" from your hand into your waiting room] At the beginning of your climax phase, you may pay the cost. If you do, this card gets +1500 power and the following abilities until end of turn. " 【AUTO】 [(1)] When this card attacks, you may pay the cost. If you do, during that attack, perform a trigger check 2 times on the trigger step." "【AUTO】 When this card's battle opponent becomes 【REVERSE】, you may choose 1 character in your waiting room, and return it to your hand."