Boxing Day

{T}: Add {C}. {T}: Add {B} or {G}. Activate only if you control a Swamp.

{T}: Add {C}. As long as Riftstone Portal is in your graveyard, lands you control have "{T}: Add {G} or {W}."

When Treva's Ruins enters the battlefield, sacrifice it unless you return a non-Lair land you control to its owner's hand. {T}: Add {G}, {W}, or {U}.

{T}: Add {C}. {G}, {T}: Regenerate target creature.

{T}: Add {C}. {T}: Add {G} or {U}. Yavimaya Coast deals 1 damage to you.

Treetop Village enters the battlefield tapped. {T}: Add {G}. {1}{G}: Treetop Village becomes a 3/3 green Ape creature with trample until end of t...

{T}: Add {C}. Threshold — {G}{W}: Nantuko Monastery becomes a 4/4 green and white Insect Monk creature with first strike until end of turn. It's s...

{T}: Add {C}. {T}: Add {U} or {R}. Shivan Reef deals 1 damage to you.

As Urza's Incubator enters the battlefield, choose a creature type. Creature spells of the chosen type cost {2} less to cast.

Players can't cycle cards.

{T}: Add {C}. {T}: Add {B} or {R}. Activate only if you control a Swamp.

{T}: Choose a color. Add one mana of that color unless any player pays {1}. Activate only as an instant.

Spawning Pool enters the battlefield tapped. {T}: Add {B}. {1}{B}: Spawning Pool becomes a 1/1 black Skeleton creature with "{B}: Regenerate this...

{T}: Add {C}. {4}, {T}, Sacrifice a land: Rath's Edge deals 1 damage to any target.

{T}: Add {C}. {2}, {T}, Sacrifice Terminal Moraine: Search your library for a basic land card, put that card onto the battlefield tapped, then shuf...

Morph {0} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.) When Proteus Machine is turned...

At the beginning of your end step, if you control no untapped lands, you gain 2 life.

Ghitu Encampment enters the battlefield tapped. {T}: Add {R}. {1}{R}: Ghitu Encampment becomes a 2/1 red Warrior creature with first strike until...

Krosan Verge enters the battlefield tapped. {T}: Add {C}. {2}, {T}, Sacrifice Krosan Verge: Search your library for a Forest card and a Plains card...

{T}: Add {C}. {T}: Add {U} or {B}. Activate only if you control a Swamp.

When Rith's Grove enters the battlefield, sacrifice it unless you return a non-Lair land you control to its owner's hand. {T}: Add {R}, {G}, or {W}.

{T}: Add {C}. {T}: Add {B} or {G}. Llanowar Wastes deals 1 damage to you.

As long as Thran Golem is enchanted, it gets +2/+2 and has flying, first strike, and trample.

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