Tribute 1 Synchro Monster. Special Summon 1 /Assault Mode monster whose name includes the Tributed monster's name from your Deck in Attack Position.
Tributing a Synchro Monster is a cost.
You can Tribute your opponent’s Synchro Monster using "Soul Exchange".
If no copies of the appropriate "/Assault Mode" monster are left in your Deck when this card resolves, your opponent can verify by briefly inspecting your Deck to confirm. Don't reveal the Deck if 3 copies of that "/Assault Mode" monster are accounted for in your GY / field / banished.
Tributing a Synchro Monster is a cost. You can Tribute your opponent's Synchro Monster using "Soul Exchange".
You can Tribute a face-down Synchro Monster.
You cannot activate "Assault Mode Activate" if you have no '/Assault Mode' monsters in your Deck.
If you activate "Assault Mode Activate" but are unable to resolve its effect because of a lack of an appropriate '/Assault Mode' monster, your opponent can look through your Deck to confirm, unless you can show 3 copies of the appropriate '/Assault Mode' monster in your GY + field + removed zone.