It's a colorless 2/2 creature with no name, no creature types, no abilities, and no mana cost (and thus mana value 0)
When you remove the last defense counter, battles are exiled and then cast transformed, but lands aren't cast
The tapping of the forests is really hurtful here because you arent able to squeeze any extra mana out of the forests you used to cast your creature
Avatar's Wrath #12 Avatar: The Last Airbender Change Version Avatar's Wrath Sorcery Choose up to one target creature, then airbend all other creatures
Fast mana, too, becomes more plentiful than what red can offer, with spells like Dark RitualDark Ritual and with Nightscape FamiliarNightscape Familiar doing a great Goblin ElectromancerGoblin Electromancer impression