Outcaster Trailblazer

• WOTC Official Reminder Textofficial rules
  Plot — Plot [cost] (You may pay [cost] and exile this card from your hand. Cast it as a sorcery on a later turn without paying its mana cost. Plot only as a sorcery.)

• WWizards of the Coast2024-04-12
  Official Ruling
  If one or more static abilities that apply to a creature entering the battlefield change its power, those abilities are considered when determining whether or not Outcaster Trailblazer’s second ability triggers. The same is true for replacement effects that apply to it, such as entering the battlefield with one or more +1/+1 counters or entering the battlefield as a copy of another creature.
• WWizards of the Coast2024-04-12
  Official Ruling
  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.
• WWizards of the Coast2024-04-12
  Official Ruling
  Outcaster Trailblazer’s first ability isn’t a mana ability. It uses the stack and can be responded to.
• WWizards of the Coast2024-04-12
  Official Ruling
  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.”
• WWizards of the Coast2024-04-12
  Official Ruling
  Once Outcaster Trailblazer’s second ability has triggered, lowering the power of the creature or removing it from the battlefield won’t stop you from drawing a card.
• WWizards of the Coast2024-04-12
  Official Ruling
  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.
• WWizards of the Coast2024-04-12
  Official Ruling
  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.
• WWizards of the Coast2024-04-12
  Official Ruling
  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.

Rulings via Scryfall