Ba Sing Se

Ba Sing Se Enters the battlefield tapped unless you control a green creature
{t}: add {g}
{3},{t}: put a defense counter on Ba Sing Se
Green creatures you control have +0/+1 for each defense counter on Ba Sing Se
{x},{t},Remove X defense counters from Ba Sing Se: green creatures you control gain +1/+0 for until the end of turn for each defense counter removed this way