Guard Barracks/ Mage School

(You may play this card as either cost, creating
that affect. You may unlock the other side for
it's cost at any time.)

Guard Barracks {2}{w}{w} - At the beginning of your end step, if you have no untapped creatures, create 2 1/1 Guard tokens.
———{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}
Mage School {u}{u} - Creatures you control have
"{1}{t}: Create one mana of any color."