Womp Family

At the beginning of your upkeep, put a 1/1 womp onto the battlefield for every 2 womp counters on Womp Family.
Whenever a womp enters the battlefield under your control, you may pay {g/w}. If you do, put a womp counter on Womp Family.
{w}{g}: Womp Family becomes a X/X Womp Horde with Haste. X is the number of womp counters on Womp Family.