Using "Ojama Trio" with this card will be a great combo. Activate it, then Special Summon 3 Tokens. Then, because they all have 0 ATK, virtually any monster discarded will instantly destroy them, inflicting 900 damage to the opponent along some other monsters of their own.
A good card to discard for the effect of "Armed Dragon LV7" is "Roc from the Valley of Haze" because most commonly used monsters have an attack of 2400. Plus "Roc" returns back into the Deck when discarded, so it can be re-used again and again.
This combo can also help with Decking out, as "Roc" can simply be discarded for the effect of "Armed Dragon LV7" when there are no cards in your Deck.