Manaborn Sapling

At the beginning of your upkeep, if you control a
creature with power 4 or greater, put a +1/+1
counter on Manaborn Sapling.
Whenever a creature with power 4 or greater
enters the battlefield under your control put a
+1/+1 counter on Manaborn Sapling.
{t} Remove X +1/+1 counters from Manaborn
Sapling, add a number of {g} equal to X to your
mana-pool.