Casterly Rock

Unspent mana you control as phases end turn into treasure tokens.
House Lannister—Whenever a Lannister creature
enters the battlefield under your control, create 3
red and white 1/1 Lannister Army creature tokens.
"Extravagance has its uses. We must demonstrate the
power and wealth of Casterly Rock for all the realm
to see."
—Tywin Lannister