You may include Dragon type Pokmon in your deck, even if your Partner is not a Dragon type, as long as all of the basic energy types in the Dragon type Pokmons attack costs are included in your Partners type identity
This red sorcery is going to be strong in a lot of scenarios, and to maximize its effectiveness, its good to use commanders that benefit from that creature type entering the battlefield or attacking, so youll get many triggers
This legendary human cleric can be a great payoff for a discard deck or simply a good sideboard card in a white-heavy meta
[3] If this card is in the Extra Monster Zone: You can Special Summon 1 Fiend monster from your hand, Deck, GY or banishment
Which just leaves why we're here: the ultimate
That's a lot of power and toughness for very little cost