This card cannot be Normal Summoned or Set. This card cannot be Special Summoned except by Tributing 1 "Armed Dragon LV7". You can send 1 card from your hand to the Graveyard to destroy all face-up monsters your opponent controls.
Level Up! Is the most useful card to quickly summon Armed Dragon LV10 out from your Deck, ignoring its Summoning conditions. Level Modulation can only be used if your Armed Dragon LV10 was Special Summoned correctly without using Level Up!, you can Special Summon Armed Dragon LV10 from your graveyard, ignoring its summoning conditions.
Since Armed Dragon LV10 is able to clear all face-up monsters your opponent controls, you can consider using Stamping Destruction to manage their backrow Spell/Traps to reduce the hindrance during your attack.
Very important to know that, you must Tribute 1 “Armed Dragon LV7” from your field to Special Summon Armed Dragon LV10 from your hand. You cannot attack with “Armed Dragon LV7” and Special Summon Armed Dragon LV10 from your Deck during your End Phase.
You can use Kidmodo Dragon to Special Summon Armed Dragon LV5 from your hand, and then either use it to attack, or use Level Up! To Special Summon Armed Dragon LV7 from your hand or deck, then use another Level Up! To Special Summon Armed Dragon LV10 from your hand or deck.
Due to the tedious process to get this monster out to the field, it is very challenging to be used in the current competitive meta.
Restart Can be used after starting hand is distributed. Shuffle all the cards from your hand into the Deck. Then draw the starting hand again.
Something being harder to get doesn't inherently imply better quality or function, in life or YGO. Obviously you were being fairly sarcastic with that response, but it still implies there should be a relation where there isn't one.