While you can only use one of these effects per turn, that will likely never come up as you'll board will already be all set when it's time to use another Thunder Dragondark effect
They often play some amount of Gravekeepers Spy (occasionally with Gravekeepers Guard) to allow for the tribute summon of Horus LV6, or Fusilier Dragon, the Duel Mode Beast, which can be used with Metamorphosis to make King Dragun and summon Horus
They have their "main owners"
Despite having pretty low battle stats Yaranzo has a very useful special ability that lets his controller exchange three crests from their crest pool for one of any kind
Foundations and Aetherdrift are both great places to start your Magic journey, but they get even better when you combine them for the ultimate multiversal experience
Pocket Monsters may have sounded awkward, or even suggestive, to English speakers