Normal summon Vortex Trooper then use these cards to give its control to your opponent. You can then attack it with your other monster which enables you to deal damage and draw a card at the same time.
These cards can work together with Vortex Trooper to thin out your deck.
Use Thunder Dragon's effect to get 2 copies of it from your deck, then summon Vortex Trooper and include 1 copy of Thunder Dragon from your hand to be returned to your deck. If you're lucky to not draw the Thunder Dragon that you returned to your deck, you can then use the effect of the remaining Thunder Dragon from your hand to get the copy that you put back in your deck.
Activate Chain Destruction when you normal summon Vortex Trooper. The copies of Vortex Trooper from your hand and deck will be destroyed which lets you draw a number of cards depending on the number of destroyed Vortex Trooper. You'll have a total of 4 cards removed from your deck if you have both copies in it.
In the official rulings, two monsters with 0 attack will not destroy each other in battle.
I honestly velieve this card is amazing in firekings nephtys. The fact that it os an engine that unbricks itself and reliably goes +1 is actually unheard of. Let's take an example with another plussin engine, the venus engine. It has a reasonable cap at +1, has a high chance to brick with multiple shine balls in hand and has not very much power. The new fireking engine can of course brick as well but since this deck has a way more diversified search potential with card of soul,pathfinder, island and now trooper makes the deck less reliant on restart and leaning more towards beatdown which will make the deck tier 0 in my opinion
Going by textbook its >65%. Anyway tier 0 is a deck that is so OP it basically have no real counter to the point of people can only run that very same deck to possibly win(reach KoG in this game). The rest are just deck that tried to counter it(and fail) and memer. Nephtys with this card definitely won't reach that. Its still slow, weak to grave removal, have hard time against real BIG mons, etc