Ghostly Prison

Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.

Impact Tremors

Whenever a creature you control enters, Impact Tremors deals 1 damage to each opponent.

Flame Rift deals 4 damage to each player.

At the beginning of each opponent's upkeep, Iron Maiden deals X damage to that player, where X is the number of cards in their hand minus 4.

This spell can't be countered.
Destroy all creatures.

End the Festivities deals 1 damage to each opponent and each creature and planeswalker they control.

Price of Progress deals damage to each player equal to twice the number of nonbasic lands that player controls.

Anger of the Gods deals 3 damage to each creature. If a creature dealt damage this way would die this turn, exile it instead.

No more than two creatures can attack you each combat.

Vigilance
Other creatures you control get +2/+2.
Creatures your opponents control get -2/-2.

At the beginning of each opponent's upkeep, Wheel of Torture deals X damage to that player, where X is 3 minus the number of cards in their hand.

Crackling Doom deals 2 damage to each opponent. Each opponent sacrifices a creature with the greatest power among creatures that player controls.

Tectonic Hazard deals 1 damage to each opponent and each creature they control.

Each player loses 1 life, discards a card, sacrifices a creature, then sacrifices a land.

This spell can't be countered.
Volcanic Fallout deals 2 damage to each creature and each player.

Destroy all nonland permanents your opponents control.

Flying, trample
Whenever Demon of Loathing deals combat damage to a player, that player sacrifices a creature.

Whenever an opponent draws a card, Underworld Dreams deals 1 damage to that player.

As long as Winter Orb is untapped, players can't untap more than one land during their untap steps.