You pay at the resolution of the triggered ability this matters only because the trigger can be Stifled, and if the card is no longer in your hand somehow (if the opponent has some instant-speed discard effect), you wont be able to cast it when the ability resolves
If they play one good blocker or a removal spell on turn 2 on the draw, you can just have four or however many good attackers the next turn and force through relevant damage
While some do seem to enjoy how well it captures the character, theyre in the minority so far
You can start the selling process by contacting the corporate office with your lot details
Wildcard slots, foil slots, bonus-sheet cards, showcase treatments, Special Guests, or other set-specific slots can push that number higher, depending on the type of pack being opened
What is the pull rate for Charmander