At first glance the most valuable are: Rayquaza (ex, in particular ), Kyogre ex, Groudon ex and Charizard
Often, card grading helps increase the value of a card
I strongly urge you to give this deck a shot, because its legitimately very competitive in the current Modern meta
A foil-stamped Signature Art Card replaces the Art Card in 5% of Set Boosters and a card from The List replaces the token or ad card in 25% of Set Boosters Toast to the Terrifying Bride Our kin cheer this endless night like it's some recompense, handed freely to every upstart with a ruffled shirt and a thirst
Put a +1/+1 counter on a creature you control
Lutri, the Spellchaser is a card that uses the new companion mechanic, which places restrictions on deckbuilding in exchange for a card that can be cast from a player's sideboard