Ego, The Ever Expanding

Constellation — Whenever an enchantment enters
the battlefield under your control, put a pod
counter on target land, without a pod counter.
Lands with pod counters have, "Whenever this
land becomes tapped, it's controller puts a pod
counter on target land they control, without a
pod counter on it."
{5}{b}{b}: Transform Ego. This ability costs {1} less for each pod counter in play.