Gateway to Tulumai

At the beginning of each other player's upkeep, if Gateway to Tulumai is untapped, that player and
you both create three 0/4 colorless Wall artifact
creature tokens with defender. Then that player
and you may pay {3} together to tap Gateway to Tulumai.
At the beginning of each other player's end step,
if Gateway to Tulumai is tapped, that player and
you both create three Gold tokens. Then untap
Gateway to Tulumai.