2005-10-01 : You can get either two mana of the same color or one mana each of different colors.

2005-10-01 : You draw a card no matter how Terrarion winds up in a graveyard from the battlefield.

2005-10-01 : You get the mana before you draw the card.

2016-07-13 : Terrarion’s last ability triggers no matter how it’s put into a graveyard from the battlefield.

2016-07-13 : You must choose the colors of mana Terrarion produces before its last ability has you draw a card.