Zygarde, the 10 Hexagons

Trample, haste
When Zygarde the 10 Hexagons enters the battlefield, add a cell counter to Zygarde that starts at
10.
Whenever Zygarde attacks, you may pay{3}{g/w} if you
do, add 10 cells to your cell counter.
Whenever Zygarde deals combat damage to a player,
create 5 0/2 cell tokens with {t} sacrifice this token:
add 1 to the cell counter on each Zygarde you control.
At the beginning of your end step, if Zyguard has 50
or more cells, Transform it.