Specifically, each two-colour combination is named after one of the titular citys guilds, as the original Ravnica block based the guilds nature on the playstyle of the 10 possible two-colour pairs
The other primary option is Vaylantz Voltage Viscount (YGOrg Translation) , the Level 4 Machine that places a Vaylantz from your Extra Deck to any Spell/Trap Zone as a Continuous Spell, while also placing one to your Pendulum Zone as a Pendulum Spell when it is moved from one Monster Zone to another
Control until you're unfair
Why would you ever want a card that negates your spells or traps
Power Tool Dragon EARTH 7 [ Machine / Synchro / Effect ] 1 Tuner + 1+ non-Tuner monsters Once per turn: You can reveal 3 Equip Spells from your Deck, then your opponent randomly adds 1 of them to your hand, and shuffle the other cards into the Deck
This cards robust HP and powerful moves ensure its more than just a pretty face its a key piece in any steel-themed strategy