Groundbreaker Monolith

Groundbreaker Monolith cost {1} less to cast
for each other card named Groundbreaker
Monolith on the battlefield, in your hand, and in your graveyard. (Any Groundbreaker Monoliths in your hand must be revealed to get the discount)
{t}: Add {c} to your mana pool for each card you control named Groundbreaker Monolith.
A deck can have up to ten cards named Groundbreaker Monolith.