T-34-85

This spell costs {x} less to cast, where X is the total
mana value of noncreature artifacts you control. •Sacrifice two artifacts: Return T-34-85 from your graveyard to your hand.
"They were given to the best units, the elite Red
Guards battalions. By 1944, around 400 had already
been delivered to front-line units and instantly
became popular with the crews. They gradually
replaced the T-34/76 and by mid-1944 the T-34-85 outnumbered older, inferior, models."