Combine this card with "Number 82: Heartlandraco" and "Kaiser Colosseum", and not only will your opponent be unable to Summon enough monsters to Xyz Summon, but they will also be unable to attack your "Number 82: Heartlandraco" to destroy it with any "Number" monsters they may already have; in addition, your "Number 82: Heartlandraco" can still use its ability to attack your opponent directly for heavy damage.
You can also use "Spirit Converter", which can attach more Xyz Material to "Number 82: Heartlandraco" to continue attacking your opponent directly. Because "Spirit Converter" is also a Continuous Spell Card, your opponent still cannot attack "Number 82: Heartlandraco".
Use this card along with "Number 40: Gimmick Puppet of Strings" so it can stay alive long enough (until the end phase of the opponent's turn) for its destruction effect to trigger.
This card is best used in a Deck centered around "Number" monsters, which can be difficult to build given the massive variety of their effects. A good strategy would be to use one of the standard Xyz archetypes backed by a Number-heavy Extra Deck. Good archetypes to try include: