I started thinking about this a few weeks ago.
For anyone with multiple blogs, sorry if I picked the wrong one.
I can add more for anyone I missed. Just let me know what your url is on Tumblr and let’s chat a bit so I get a feel of what kind of card you would be.
These are in no particular order.
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@lyralumina fairy/union/effect 7Stars 1800ATK/1200DEF FIRE
When this card is normal summoned monsters used to tribute it become equip cards and are placed in available spell and trap card zones. This monster gains an additional attack for every monster equipped to it. If this monster would be destroyed instead destroy one monster equipped to it.
@starmaiden777 spellcaster/effect 5Stars 1500ATK/2000DEF EARTH
When this card is normal or flip summoned special summon sibbinthegivengibbon or duelistkingdom from your hand, deck, or graveyard. As long as there is another monster, besides this one, on the field, this monster can attack your opponent directly.
@sibbinthegivengibbon winged-beast/effect 4Stars 1600ATK/400DEF WIND
When this card is special summoned deal 600 points of damage to your opponent's life points.
@duelistkingdom fiend/effect 3Stars 1400ATK/1600DEF DARK
When this card is special summoned send up to 2 cards on your opponent's field to the graveyard.
@baka-ra thunder/effect 3Stars 1300ATK/1300DEF LIGHT
When this monster is Flip Summoned, all opponent’s monsters switch battle positions.
@phasart dragon/fusion 6Stars 2100ATK/2800DEF FIRE
1 DARK ATTRIBUTE MONSTER + 1 LIGHT ATTRIBUTE MONSTER
Must be Fusion summoned and cannot be special summoned other ways. This monster cannot change sides do to Spell, Trap, or Monster effect.
@leapinlilzards warrior/tuner/effect 4Stars 1500ATK/1800DEF WATER
When this card is Normal, Flip, or Special Summoned all Equip Spell and Continuous Spell cards in the Graveyard are shuffled into their owner’s deck.
@grapegodperson fairy/synchro/effect 7Stars 2400ATK/1200DEF LIGHT
1 Tuner + 1 or more non-tuner monster
In the end phase of your opponent’s turn, regain 200LP for each monster on the field.
Equipped monster gains 200ATK for every card in your hand.
@cosmopoeicpower Field Spell
You can special summon one monster with 1600ATK or less from your graveyard during your end step. Special summoned monsters get an extra 500ATK on the opponent's turn following the one in which they are special summoned.
@ladybubblegum Equip Spell
If your opponent’s field has more cards in the Monster Zone than you do, the equipped monster can attack twice.
@seto-kaibaes Normal Spell
Both you and your opponent return one Trap or Spell card from the Graveyard to the field.
@drawing-cookie Quick-play Spell
Reveal a Monster Card with over 4Stars in your hand and all Monsters on the field with 4Stars or less cannot be destroyed during this Battle Phase.
@corporatedragon Counter Trap
Discard one spell card to the Graveyard. Your opponent cannot activate spell cards for the next 2 turns and all Continuous Spell cards, face-up on their side of the field, are destroyed.
At the end of your opponent's turn gain 400LP for every card in yours or your opponent's graveyard.
Every time a monster is special summoned from the graveyard, your opponent takes 300 points of damage.
@bakura-the-dungeon-master Normal Trap
When your opponent declares a direct attack on your life points, summon 2 “Dungeon Tokens” (Dragon-Type/Tuner/2Stars/DARK/1000ATK/1000DEF)