yugioh cards that add xyz material Yu-Gi-Oh!: 10 Strongest Monsters Ever, Ranked Abyss Rising Overview Part 7:

Wrap Up Eriette, the Beguiler | Illustration by Chris Rallis Esper is undoubtedly one of the Magic's most versatile color combinations, as you can choose from at least four different archetypes to brew around

There are a bunch of other examples out there but I thought this one showed it pretty easily

Ayara, First of Locthwain Between the mana cost and the restriction on what you can sacrifice, Ayara, First of Locthwain works best in mono-black or near-mono-black lists

And he has an activated ability which costs no mana and generates X mana in any combination of red and/or blue, where X is his power

It is just a little too much on a four-mana 4/4