These cards would greatly help Sergeant Electro to make it not susceptible to attacks.
You can equip 7 completed to Sergeant Electro since it's a Machine-Type monster. Permanent 700 increase to attack or defense is a great increase in the current meta.
Destroy your opponent's monster with a very high attack by equiping Metalmorph. Besides from the 300 boost to its attack and defense, it gains half of the attack of the attack target during the damage calculation.
Rare Metalmorph is another card that can only be used to Machine-Type monsters. Activate this card to increase Sergeant Electro's attack by 500. It also has an effect that could negate spells that targets the monster that is affected by Rare Metalmorph's effect.
Sleight of Hand
Sleight of Hand Can be used each time your Life Points decrease by 1500. Add 1 7 Completed card, hidden in your wristband, to your hand. This skill can only be used once per turn and twice per Duel.
I kind of underrated and didn't bother about this card at first, but after getting my first copy it immediately showed results on Ranked and I ended up getting another one. This thing puts in a lot of work for beatdown decks with the meta so heavy with Etaqua/Controller/Mirror Wall backrows.
The meta changes frequently and I guess it isn't updated. I personally think Sergeant Electro is one of the best monsters in the game for this current meta game where backrow is the key factor to success. Riryoku in my opinion isn't really as good anymore because you're likely just going to get stunned in some way when trying to make an offensive push. I find the ratings to be laughable
I don't think either of the rankings can really be justified as the "meta changing too frequently." Sergeant Electro has been an insanely good monster since it came out and I can't remember a time when Riryoku was good outside of farming. If you want a way to boost your attack Metalmorph is simply the better option in 99% of scenarios, while also being easy to obtain from leveling Keith.
If you can get 3 get 3 card is really strong and in a Sleight of Hand Deck it becomes even better
How does this card works? Do I activate the effect and the face down card cannot be activated ever again? I'm pretty sure it works like harpie ground when you try to target the face down card it can still be activated that turn.