Training Grounds
March of the Machine: The Aftermath (MAT #9)
Training Grounds
CMC: 1
Type
Enchantment
Rules Text
Activated abilities of creatures you control cost 
less to activate. This effect can't reduce the mana in that cost to less than one mana.
Printing
March of the Machine: The Aftermath (MAT #9)
rare
Illustrated by A. M. Sartor