Olive Tree

At the beginning of your upkeep, you may put a
+1/+1 counter on target creature you control.
If that creature is a uses any {g} mana to cast it, put
two +1/+1 counters on it instead. If it uses any {b} mana to cast it, put a -1/-1 counters instead.
"Wherefore, go thy way; watch the tree, and nourish
it, according to my words."
—Jacob 5:12