Beaver

Level Up (You may pay {x} at any time to level up
this creature, where {x} is its level plus 1. Also it
starts on level 1.)
Level 1 - {t} Sacrifice Beaver: Give 2 target
creatures +0 +1.
Level 2 - {t} Sacrifice Beaver: Give 2 target
creatures +0 +2.
Level 3 - {t} Sacrifice Beaver: Give 2 target
creatures +0 +3.