Damping Sphere

If a land is tapped for two or more mana, it produces {C} instead of any other type and amount.
Each spell a player casts costs {1} more to cast for each other spell that player has cast this turn.

Damping Matrix

Activated abilities of artifacts and creatures can't be activated unless they're mana abilities.

Pyrostatic Pillar

Whenever a player casts a spell with mana value 3 or less, this enchantment deals 2 damage to that player.

Dream Tides

Creatures don't untap during their controllers' untap steps.
At the beginning of each player's upkeep, that player may choose any number of tapped nongreen creatures they control and pay {2} for each creature chosen this way. If the player does, untap those creatures.

Aether Flash

Whenever a creature enters, this enchantment deals 2 damage to it.

Thorn of Amethyst

Noncreature spells cost {1} more to cast.

Keranos, God of Storms

Indestructible
As long as your devotion to blue and red is less than seven, Keranos isn't a creature.
Reveal the first card you draw on each of your turns. Whenever you reveal a land card this way, draw a card. Whenever you reveal a nonland card this way, Keranos deals 3 damage to any target.

Imi Statue

Players can't untap more than one artifact during their untap steps.

Lodestone Golem

Nonartifact spells cost {1} more to cast.

God-Pharaoh's Statue

Spells your opponents cast cost {2} more to cast.
At the beginning of your end step, each opponent loses 1 life.

Circle of Flame

Whenever a creature without flying attacks you or a planeswalker you control, this enchantment deals 1 damage to that creature.

Dissipation Field

Whenever a permanent deals damage to you, return it to its owner's hand.

Squeeze

Arena of the Ancients

Legendary creatures don't untap during their controllers' untap steps.
When this artifact enters, tap all legendary creatures.

Arcane Laboratory

Each player can't cast more than one spell each turn.

Blood Moon

Frozen Aether

Artifacts, creatures, and lands your opponents control enter tapped.

Rug of Smothering

Flying
Whenever a player casts a spell, they lose 1 life for each spell they've cast this turn.

Damping Engine

A player who controls more permanents than each other player can't play lands or cast artifact, creature, or enchantment spells. That player may sacrifice a permanent of their choice for that player to ignore this effect until end of turn.

Mana Breach

Whenever a player casts a spell, that player returns a land they control to its owner's hand.