An Xyz Monster's Rank is not its Level. Xyz Monsters do not have Levels. Therefore, Xyz Monsters can attack past "Gravity Bind." They are also unaffected by "Level Limit - Area B", giving them an advantage over the popular Synchro Monsters when playing against a stalling Deck.
Using the effect of "Cosmic Fortress Gol'gar", this can be returned to your hand for an A-Counter, then Set it. It can be activated on your opponent's turn to prevent them from attacking. On your turn, return it to your hand again and repeat.
Although your monsters that are Level 4 and higher can't attack, nothing stops you from Summoning them. Play a monster with a high ATK like "Blue-Eyes White Dragon" to ensure that your opponent won't be able to destroy it. This is useful for stalling.
Equipping a higher Level monster with one or more "Demotion" cards is a good offensive strategy.
Great in an "Iron Chain" Deck as it prevents your opponent from destroying your monsters (most of the time) allowing yourself to use "Poison Chain" to its full potential.
If a good amount of monsters have built up on your field, and "Gravity Bind" is on the field, Summon "Jinzo" to negate "Gravity Bind," then attack with everything to win the duel.
"Copycat" can be very useful if your opponent has a monster with high ATK on the field.
Summon a monster with high ATK, and use "Feedback Warrior" to make it Level 3, allowing yourself to attack with it.
If there is a lot of cards in your hand, use "Tragoedia" and select a Level 3 or lower monster in the Graveyard. Its effect can also be used to discard monsters from your hand that cannot be Summoned while "Gravity Bind" is on the field, and take control of your opponent's monsters, assuming they are the appropriate Levels.
Use this with "Tyrant's Temper", so that only your opponent's monsters will be affected.
When high ATK monsters are on the field e.g. ATK of 2500 above, stall until "Black Illusion Ritual" and a Level 1 or above monster is drawn to Ritual Summon "Relinquished", which is a Level 1 card and use its effect on a high ATK monster.
This card can help protect "Raging Flame Sprite" while it gains ATK through its effect.