Sildrox, Primordial Elder

Hexproof, Reach, Trample, Indestructible
{t}: Add {b}, {g}, or {u} to your mana pool
{4}, {t}: Tap target nonland permanent, it does not untap as long as you control Sildrox, Primordial Elder
For eons it has guarded the land with its cunning and ferocity. It has witnessed things no mortal can comprehend.
-Valdrax the Overmind