This card works well in Plant-Type Decks. To start off with a strong first turn, Summon "Lonefire Blossom", Tribute to Summon "Gigaplant". Then equip it with "Supervise", use the effect of "Gigaplant" to Special Summon "Lonefire Blossom" and Tribute it again to Special Summon another "Gigaplant" or any other Plant-Type monster from your Deck.
This card is also good in a Plant-Type Decks mid/late game. Summon "Lonefire Blossom" and Tribute it to Special Summon "Gigaplant" if it isn't already on the field. Equip "Gigaplant" with "Supervise", Special Summon "Lonefire Blossom" and Tribute it to Special Summon "Copy Plant". Synchro Summon for "Black Rose Dragon". As "Supervise" activates in the Graveyard, Chain the effect of "Black Rose Dragon" to destroy all cards on the field. All cards will be destroyed, and then "Gigaplant" can be Special Summoned from your grave while your opponent has no cards on the field.
"Hidden Armory" could potentially increase the number of Gemini monsters in your Graveyard while searching for "Supervise".
This card can be combined with "Gemini Spark", "Dark Valkyria" and "Double Summon" to gain serious card advantage. Summon "Dark Valkyria", equip "Supervise", and use its effect to destroy a monster. Tribute it with "Gemini Spark" to destroy any enemy card and draw a card. Bring it back with "Supervise", cast "Double Summon" to activate it, and use its effect again.
"Giant Trunade" can also be used to return "Supervise" to your hand and re-equip it to use its effect again on the same turn.
Use "Call of the Mummy" to Special Summon an "Il Blud" from your hand and Gemini Summon it. Use its effect to Special Summon a second "Il Blud". Then, equip it with this card and use its effect to Summon a third one. If this card is destroyed, its effect can be used to bring back one of the "Il Bluds" and restart the swarming.
Select one of your cards equipped with "Supervise" when activating "Different Dimension Gate". One of your foes monsters will be banished and "Supervise" will go to the grave, activating its second effect. If your opponent had only one monster (like after performing a Synchro Summon for example), a direct attack can be performed.
Alternatively, "Gemini Soldier" can be an excellent target for revival if there is a means to activate it, as it will be able to Special Summon monsters from your Deck.
This card works very well with "Gigaplant" OTK Deck. Use "Lonefire Blossom" to get out "Gigaplant", equip "Supervise" and Special Summon "Copy Plant", then Synchro "Power Tool Dragon". "Gigaplant" comes back, use "Power Tool Dragon" to get more "Supervise", and repeat the step until the field is full of "Power Tool Dragon" and "Gigaplant". There is a enough Equip Spells need edto pull off this OTK, just for the price of 3 cards.
This card can be used in a "Neo-Spacian" Deck to have "Elemental HERO Neos Alius" be treated as "Elemental HERO Neos". After it leaves the field (probably by Contact Fusion), "Neos" (or "Neos Alius") may be Special Summoned from your Graveyard. "Elemental HERO Prisma" can also be used to reveal "Neos", and have its name treated as "Elemental HERO Neos" to use "Wrath of Neos", and then Special Summon "Neos" from your Graveyard, after "Wrath of Neos" destroys all cards on the field.
Equip this card to a Gemini monster to use its effects. Then banish it from the field to Summon a monster from your grave by:
Battling a stronger monster. So a stronger one can be sUmmoned from your grave during the Battle Phase.
Giving it back to the hand.
This card also works very well with "Blazewing Butterfly". Equip it to "Blazewing" and Tribute it, so another Gemini can be placed in your Graveyard (with its effect), but "Supervise" would be sent to the Graveyard, and let yourself Special Summon another Gemini monster in your Graveyard. This combo can be further enhanced by "Card of Safe Return", 2 cards are drawn (1 card due to "Blazewing", 1 more due to "Supervise"). Use this after using "Future Fusion" for "Superalloy Beast Raptinus", sending two strong Gemini monsters, to get one back with its effect and one without it.