While your logic looks good it overlooks the relevance of choices within packs
Finally, Red + Green Burn tends to punish what Green hates, namely all-things winged or artificial (Clan Defiance, Cindervines, Ruric Thar, the Unbowed, etc.), or staples Burn onto already-useful effects (Vengeful Rebirth, Exploding Borders, etc.)
The brief for this article read with an audible sigh to me: I guess we should mention Princess Twilight Sparkle. It was even highlighted in a rarely seen desultory orange color so Id see it
Some people just wanted more cards, not realizing that this was not to their advantage, but others realized that most decks were not designed to be able to take full advantage of a second draw every turn
While this might not seem like a big additional cost, it's been proven time and time again that this life loss can very easily turn a victory into a defeat
The fools thought me dead