Remove from play 1 "Assault Mode Activate" from your Graveyard. Destroy all monsters you control and Special Summon 1 "/Assault Mode" monster from your Graveyard, ignoring its Summoning conditions. Its effect(s) is negated, and it cannot be Tributed. If it is removed from the field, remove it from play.
Banishes from your field / Banishes from Graveyard for cost
Destroys your Monster Cards / Negates the effects of your Effect Monsters
Ignoring the Summoning conditions / Special Summons from your Graveyard
Ruling: you must destroy at least 1 monster you control with “Assault Revival” in order to Special Summon an “/Assault Mode” monster, as the effects are linked. You also must destroy all monsters you control, so if 1 of your monsters was not destroyed, you cannot Summon an “/Assault Mode” monster.