While you control a Memento monster, your opponent s monsters that can attack must attack the Memento monster you control with the highest ATK (their choice, if tied). When your opponent activates a monster effect on the field (except during the Damage Step): You can target 1 Mementoal Tecuhtlica – Combined Creation you control; it loses exactly 1000 ATK DEF, and if it does, negate that activated effect. You can only activate this effect of Mementotlan Cranium Burst once per Chain.