Ulamog and Kozilek, Immortals

Indestructible, trample
When Ulamog and Kozilek, Immortals enters the battlefield, each player mills six cards.
Ulamog and Kozilek's power is equal to
the number of creature types in all players' graveyards among non-Coward creatures.
All creatures able to block Ulamog and Kozilek
do so.
"What's the only thing that can stop a compleat
Eldrazi titan? It's quite simple."
—Sorin Markov