You can keep pumping out resources turn after turn, but be aware that if you start getting low on life, there's not much you can do to stop it with Black Market Connections since it is guaranteed to trigger at the top of each turn
Similarly, Joyous Melffys' effect lets you detach a material to give every Melffy a direct attack that turnincluding itself and its 2000 ATK, the highest by far in the archetype
The pictures, for instance, are him dressing up as Tahngarth, Phage, Gerrard, Kamahl, Akroma, and Squee (Tahngarth, Gerrard, and Squee were from the Weatherlight Saga, and Phage, Kamahl, and Akroma were from the Odyssey/Onslaught story.) 4
I personally would prefer to use its exile each opponents graveyard ability, but if you are desperate for a card, you can use the draw a card ability instead
Spanish Cambio de Sincro Retira del juego 1 monstruo Sincro boca arriba que controles