Artorias' Sparring Ring

Artorias' Sparring Ring enters the battlefield
tapped.
{t} Add {w} or {r}
Graft 3 (This land enters the battlefield with 3
+1/+1 counters on it. Whenever a creature
enters the battlefield, you may move a +1/+1
counter from this land onto it. Sacrifice this land
when it is out of +1/+1 counters).