This card is excellent in decks of Gemini monsters, as most of them are level 4 and one of the biggest weak points of the deck (traps that counter summoning) are frequently used when there is already another Gemini monster on the field.
This card can also be helpful in "Six Samurai" decks, as most "Six Samurai" monsters are either level 3 or level 4.
Best used with cards that Special Summons Token Monsters, because they usually have the same Levels and they're easy to Summon.
Especially useful with the Phantom Beast Planes since their many cards all spawn the same types of Tokens.
This card is very helpful in Counter Fairies as most of the monsters will be the same level.