Be sure to choose ones with slots big enough for sleeved cards - it'll save you a lot of hassle
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
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
This lets you then search your deck for any card
This deck can stay alive not just with counterspells and stall effects like Propaganda, but also lifegain from Venser's Journal while drawing cards as fast as possible
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