Boxing Day

{T}: Add one mana of any type that a land you control could produce.

{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.)

When you cast this spell, amass Orcs 5, mill five cards, then return a creature card from your graveyard to the battlefield. Trample Whenever a com...

{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.

Noncreature spells cost {1} more to cast.

Equipped creature gets +1/+1. Whenever equipped creature attacks, you may search your library for a basic land card, put it onto the battlefield ta...

Equipped creature gets +2/+2 and has protection from green and from white. Whenever equipped creature deals combat damage to a player, exile up to ...

Equipped creature gets +1/+1 and has trample and lifelink. {1}: Permanents your opponents control lose hexproof and indestructible until end of tur...

Whenever you activate an ability, if it isn't a mana ability, you may pay {2}. If you do, copy that ability. You may choose new targets for the copy.