If you're casting a plotted card from exile without paying its mana cost, you can't choose to cast it for any other alternative costs. You can, however, pay additional costs, such as kicker costs. If the plotted card has any mandatory additional costs, those must still be paid to cast the spell.

If you plot the top card of your library, you must exile that card and pay its plot cost before you may look at the new top card of your library.

You can't cast a plotted card on the same turn it became plotted. On any future turn, you may cast that card from exile without paying its mana cost during your main phase while the stack is empty.

If the top card of your library normally has plot, you may plot that card using its own plot cost or the plot cost given to it by Fblthp.

Plot abilities are written "Plot [cost]," which means "Any time you have priority during your main phase while the stack is empty, you may pay [cost] and exile this card from your hand. It becomes plotted."

Exiling a card using its plot ability is a special action. Once you announce you're taking that action, no other player can respond by trying to remove that card from your hand.

If a plotted card has in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.

While you control Fblthp, you can look at the top card of your library whenever you want (with one restriction; see below), even if you don't have priority. This action doesn't use the stack. Knowing what that card is becomes part of the information you have access to, just like you can look at the cards in your hand.

If an instant or a card with flash is plotted this way, you can still cast it only when you have priority during your main phase while the stack is empty.