Controlled loop A controlled loop is a series of voluntary actions that can be repeated as many times as a player wants . There is no uncontrollable element to these loops and a player can choose to stop them at any time , so they are legal to use , in contrast to infinite loop s , which the players have no control over once they start . Some loops that require only a few cards ( fewer than 4 ) to execute have caused cards to become Forbidden or Limited on the current Forbidden / Limited lists , as otherwise their presence would be detrimental to gameplay . Examples . Quillbolt Loop . This uses the effect " Quillbolt Hedgehog " to Special Summon itself by having a Tuner on the field along with an effect that Tributes a monster for damage such as " Cannon Soldier " . " Quillbolt " can be Tributed again and again and continuously revived as long as the player controls a Tuner , because " Imperial Iron Wall " prevents " Quillbolt Hedgehog " from being banish ed by its own effect . A variation of this loop that does not rely on " Imperial Iron Wall " uses " Plaguespreader Zombie " . Summon both " Quillbolt " and " Plaguespreader " to the field , and Xyz Summon " Ghostrick Socuteboss " , then activate its effect by detaching an Xyz Material ( it doesn ' t matter which one ) . Then , Summon " Ghostrick Angel of Mischief " by using " Socuteboss " as the Xyz Material , then detach the other original Xyz Material ( both " Quillbolt " and " Plaguespreader " will now be in your Graveyard ) to add any " Ghostrick " Spell / Trap to your hand . Place the added card back on top of your Deck to revive " Plaguespreader " , then revive " Quillbolt " with its effect . This returns to the start of the loop . Flint Lock Loop . This uses " Flint " and two " Flint Lock s " to pass the " Flint " back and forth . The Spell Card " Morale Boost " is used to gain 1000 Life Points every time an Equip Card is equipped . Because no Equip Card leaves the field , the effect to lose 1000 Life Point is never activated . This allows a player to gain an unlimited number of Life Points while the opponent may be powerless to stop it . Gearfried Loop . If a player controls " Gearfried the Iron Knight " , then it is possible to activate " Butterfly Dagger - Elma " an unlimited number of times per turn , by equip ping it to " Gearfried " , whose effect will destroy it , at which point " Elma ' s " effect will return it to the hand to be equipped again . This can easily be combined with " Royal Magical Library " to draw an unlimited number of cards in one turn ( causing an easy Exodia FTK , etc . ) . Another option is to combine it with " Spell Absorption " to gain an arbitrarily high number of Life Points ; adding " Fire Princess " gives an unlimited amount of damage to inflict in one turn on top of that . This loop is the reason why " Butterfly Dagger - Elma " is currently Forbidden on the Forbidden / Limited List . Gate Material Loop . By combining " Fusion Gate " and " Chain Material " , it is possible to Summon or activate nearly any card an unlimited number of times per turn , through the correct ( and very risky ) setup . These loops generally revolve around Fusion Summoning several Fusion Monster s by banish ing Fusion Material Monster s from the Main Deck , followed by using said monsters to activate effects or Summon other monsters , then finally Fusion Summoning " Elemental HERO Electrum " to return the originally banished monsters back to the Deck to be banished again . For an example , see Elemental HERO Gustav Max OTK , an OTK that involves Summoning " Superdreadnought Rail Cannon Gustav Max " at least four times in one turn . For further and more detailed examples of possible setups , see this external link . Primal Seed Loop . If a card is active that banishes Spell Cards that would go to the Graveyard ( such as " Macro Cosmos " or " Banisher of the Light " ) , and there is a " Black Luster Soldier - Envoy of the Beginning " or " Chaos Emperor Dragon - Envoy of the End " on the field , then any player with two copies of " Primal Seed " and a Normal or Quick - Play Spell Card in their hand can activate that Spell Card an unlimited number of times per turn , by repeatedly using one copy of " Primal Seed " to bring back the other copy along with that Spell Card . This allows for an OTK with a card as weak as " Sparks " , as well as numerous other possibilities such as arbitrarily high Life Points or ATK . This loop is why " Primal Seed " is currently Limited in the " OCG " ; it was Limited in the " TCG " as well until 1 April 2014 . Wicked Worm Beast Loop . If " The Wicked Worm Beast " is Special Summoned during the End Phase , it is automatically returned to the hand . Therefore , if a player has 7 or more cards in their hand in the End Phase of the turn and " Dark World Grimoire " active , they can discard " Wicked Worm Beast " , Special Summon it with " Grimoire " , and return it to the hand again . Although this has limited value , if the opponent activated " Maxx " C " " , they could deck out . Similar strategies can occur using " DNA Surgery " and " Cyber Summon Blaster " or " Soul - Absorbing Bone Tower " , the latter of which also works with " Zombie World " . This loop is more easily achieved using " Silent Wobby " with a card that takes control of it .