While the Shining Celebi from Neo Destiny is more valuable than some cards listed, the market price has not been updated to reflect this, so Celebi is omitted, for now
2G is very low for a card which can singlehandedly win the game like this, while two mana is cheap enough to reliably pay even if you had to use some mana to gain life in the first place (or to pay for multiple tokens per turn)
On the other hand, the Charizard Gold Star hasn't had recent sales, so it cannot feature among the best cards from this era until a market price is re-established
To illustrate what I mean, let's consider a turn where your opponent simply draws a card, plays a land, and says, "Go." Your opponent has whizzed through his or her turn, but technically speaking his or her upkeep, combat phase, and end of turn step have still happened, and you have the option to cast a spell at any of these times
This gives the game a huge number of combinations