Headwater Pyramid

Headwater Pyramid comes into play tapped.
{t}: Add {g}, {u}, or {r}.
"The scouts' reports make it clear the farther up the
Luxa, the older the foundations. The last pyramids
before the impassible third cascade shows clear signs
of contact with an alien culture; or perhaps several.
Built with a flat top, as if offering a perch for some
enormous beast like the God-Pharoah. Curse his
horns." - Kissa, Elder Vizer of Kfnet's Lore