Boxing Day

Look at target opponent's sideboard. You may cast a card from that sideboard without paying its mana cost. Exile Command the Chaff.

Flash Enchant instant or sorcery spell on the stack When Animate Spell becomes attached to an instant or sorcery, put that card onto the battlefiel...

Choose target creature you own and control. That creature becomes your commander. Any other commanders you have are no longer your commander. (That...

When Wizened Arbiter enters the battlefield, you may reveal a white card you own from outside the game. If you do, exchange that card with a card i...

When Stack of Paperwork enters the battlefield, draw a card. Combat damage uses the stack. (Combat damage assignment can be responded to before dam...

Taiga Stadium enters the battlefield tapped unless you control a white, blue, or black permanent. {T}: Add {R} or {G}.

Before drawing your hand, you may start the game with Rift in your opening hand. If you do, draw one fewer card. (Mulligans continue as normal.) Ri...

{T}: Add {B} or {G}. You get a poison counter.

(Jasconian Isle isn't a spell, it's affected by summoning sickness, it's blue, and it has "{T}: Add {U}.") Jasconian Isle enters the battlefield ta...

{T}: Add {C}. Legacy — {T}, Mark one of Gold Mine's unmarked nodes: Add one mana of any color. ☐, ☐, ☐, ☐, ☐

Enchanted Prairie enters the battlefield tapped. {T}: Add {W} or {U}.

Domesticated Watercourse enters the battlefield tapped. {T}: Add {U} or {B}. {U}{B}: Until end of turn, Domesticated Watercourse becomes an Equipme...

{T}: Add {C}.

At the beginning of your combat step, tap Aggressive Crag. {T}: Add {R} or {W}.

Upgrade (This creature enters the battlefield covering another artifact you control. If it can't, exile it. Ignore the artifact it's covering. Anyw...

Target creature or player gains flying until end of turn. (Players with flying can't be dealt damage by creatures without flying.)

As Pithing Spyglass enters the battlefield, name a keyword ability or ability word. All cards in all zones lose that keyword ability or ability wor...

Reflect {0} (As this enters the battlefield, each opponent may pay {0}. When they do, they create a token copy of this except it lacks this ability...

When Chronobot enters the battlefield, switch upkeep steps with target opponent for as long as it remains on the battlefield. (You take your upkeep...

Flying, deathtouch When Zyym, Mesmeric Lord enters the battlefield, target opponent chooses an order for the cards in their hand, then reveals them...

Put a manabond counter on all creatures. (They lose all other abilities and become lands with "{T}: Add one mana of this card's color.")

Eldrazi you control are Slivers in addition to their other types. Slivers you control have devoid and annihilator 1. {3}: Create a 1/1 colorless El...

Create two 1/1 white Warrior creature tokens with vigilance.

Destroy target artifact.