If a card in your hand is already revealed (perhaps because it was revealed to pay a cost of a spell that's still on the stack or due to the effect of a card like Telepathy), you may reveal it again to pay the cost of another spell or ability that requires you to reveal a card from your hand
Fun fact: Lucario is one of the few Pokmon that can understand human speech and communicate through aura
Normally, a creature's base power is the power printed on the card, or, for a token, the power set by the effect that created it
Be sure to choose ones with slots big enough for sleeved cards - it'll save you a lot of hassle
You'll need the basic Pokmon in play before you can evolve it into Gengar
Dirgur Focusmage synergizes well with its Braingeyser part, as it lowers the cost of your instant and sorcery spells, and casting spells with mana value five or more will allow you to cast Braingeyser for additional draw