Siren's Call

Cast this spell only during an opponent's turn, before attackers are declared.
Creatures the active player controls attack this turn if able.
At the beginning of the next end step, destroy all non-Wall creatures that player controls that didn't attack this turn. Ignore this effect for each creature the player didn't control continuously since the beginning of the turn.

Control Magic

Enchant creature
You control enchanted creature.

Prismatic Lace

Target permanent becomes the color or colors of your choice. (This effect lasts indefinitely.)

Festival

Cast this spell only during an opponent's upkeep.
Creatures can't attack this turn.

Island

Plains

Phantasmal Terrain

Enchant land
As this Aura enters, choose a basic land type.
Enchanted land is the chosen type.

Martyr's Cry

Exile all white creatures. For each creature exiled this way, its controller draws a card.

Magical Hack

Change the text of target spell or permanent by replacing all instances of one basic land type with another. (For example, you may change "swampwalk" to "plainswalk." This effect lasts indefinitely.)

Karma

At the beginning of each player's upkeep, this enchantment deals damage to that player equal to the number of Swamps they control.

Lifetap

Whenever a Forest an opponent controls becomes tapped, you gain 1 life.

Prodigal Sorcerer

{T}: This creature deals 1 damage to any target.

Sleight of Mind

Change the text of target spell or permanent by replacing all instances of one color word with another. (For example, you may change "target black spell" to "target blue spell." This effect lasts indefinitely.)

Circle of Protection: White

{1}: The next time a white source of your choice would deal damage to you this turn, prevent that damage.