Calm Before the Storm

While Calm Before the Storm is in play, players skip their combat phase.
At the beginning of your upkeep, sacrifice Calm Before the Storm. Until end of turn combat damage is doubled. At the beginning of the next pre-combat main phase, all players sacrifice all creatures.
"Take a moment, pray to God. For in the next hours no one will hear you in the screams of the dying and the clash of steel." -Katrya