Spooky20

{T}: Add one mana of any color. Spend this mana only to cast a multicolored spell.

{T}: Add {U}. {1}: Return Oboro, Palace in the Clouds to its owner's hand.

{T}: Add {C}. {4}{S}, {T}, Sacrifice Mouth of Ronom: It deals 4 damage to target creature. ({S} can be paid with one mana from a snow source.)

{T}: Add {U}. {U}, {T}: Untap target legendary permanent.

{T}: Add {C}. {1}{W}, {T}: Prevent all combat damage that would be dealt by target attacking creature this turn.

{T}: Add {W}. {T}: Return target legendary creature to its owner's hand.

{T}, Pay 1 life: Add {G} or {W}. {1}, {T}, Sacrifice Horizon Canopy: Draw a card.

{T}: Add {C}. {T}: Each player gains control of all creatures they own.

If Gemstone Caverns is in your opening hand and you're not the starting player, you may begin the game with Gemstone Caverns on the battlefield wit...

{T}: Add {C}. {1}, {T}: Untap target land.

As Cavern of Souls enters the battlefield, choose a creature type. {T}: Add {C}. {T}: Add one mana of any color. Spend this mana only to cast a cre...

Castle Ardenvale enters the battlefield tapped unless you control a Plains. {T}: Add {W}. {2}{W}{W}, {T}: Create a 1/1 white Human creature token.

{2}, {T}: Add {B} for each Swamp you control.

Boseiju, Who Shelters All enters the battlefield tapped. {T}, Pay 2 life: Add {C}. If that mana is spent on an instant or sorcery spell, that spell...

Bojuka Bog enters the battlefield tapped. When Bojuka Bog enters the battlefield, exile target player's graveyard. {T}: Add {B}.

{T}: Add {C}{C}. Ancient Tomb deals 2 damage to you.

({T}: Add {W}.)

({T}: Add {R}.)

({T}: Add {R}.)

This land enters tapped. When this land enters, you gain 1 life. {T}: Add {R} or {G}.

This land enters tapped. {T}: Add {R}, {G}, or {W}.

({T}: Add {U}.)

This land enters tapped. When this land enters, you gain 1 life. {T}: Add {G} or {W}.

({T}: Add {G}.)