Long Quan, The Emerald Fist

Convoke (Your creatures can help cast this spell.
Each creature you tap while casting this spell pays
for {1} or one mana of that creature's color.)
Whenever another creature enters the battlefield
under your control, put a ki counter on Long
Quan, The Emerald Fist.
{g/w}{g/w}{g/w}{g/w}: Long Quan gets +X/+X until end of
turn, where X is the number of ki counters on him.