IJN Yuudachi (Retrofit)

X is the number of lands you control.
IJN Yuudachi (Retrofit) power and toughness is
equal to the number of lands you control.

Landfall — Whenever a land enters the
battlefield under your control, put one +1/+1
counter on IJN Yuudachi (Retrofit) for each land
you control.
{g}{g}{g}{g}{g}, {t}, Return all lands you control to
your hand: Put five lands from your hand into
battlefield.