:
Flame Javelin 's casting cost is still corrupted. The game demands to pay 6 colorless mana each whenever the player has 6 or more mana sources that can be used, even if I have at least 3 red mana sources.
Instead, the game allows to pay the spell's casting cost by paying R instead than 2 only if the player has less than 6 mana sources on the battlefield.
EG: if I have 6 untapped mountains, if I try to cast flame javelin, the game will still ask me to pay 6.
If I have 5 mountains, then it will demand to pay 4R. The game will make me pay RRR only if I have just 3 mountains untapped and no other mana sources.