Chipi

Upkeep: put a dirt-token on this creature, can't
have more than 1 dirt-counter/token.
{0}: exchange dirt-token for a +1/+1 dirt-counter
on this creature.
{u}: this creature gets +1/+1 until end of turn and
destroy dirt-counter at the end of the turn.
you can't spend more than {u} this way.