Similarly, the player, planeswalker, or battle it attacked doesn't have to still be in the game or on the battlefield
The important difference is that Siege-Gang Commander creates the tokens as part of its enters effect rather than forcing you to spend mana to create them
It also adds a dynamic variable risk to the card based on the power difference between the thing you exile and the dinosaur
I am not the one saying it, it is common sense and what the Japanese metagame (where they are already using the new cards) has been telling us for a while
To put that into perspective, the vintage grail for most collectors is the Shadowless Charizard, which ungraded sells for around the $750 mark
Against four or five, you will likely be getting many in any color out of this