Boxing Day

Counter target spell unless its controller pays {1} for each card in your hand.

Counter target spell if no mana was spent to cast it.

Whenever Frost Titan becomes the target of a spell or ability an opponent controls, counter that spell or ability unless its controller pays {2}. ...

Switch target creature's power and toughness until end of turn. Draw a card.

Flying When Gossamer Phantasm becomes the target of a spell or ability, sacrifice it.

Flying Prowl {2}{U} (You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Faerie or Rogue.) When Latchkey F...

Take an extra turn after this one. Skip the untap step of that turn.

Whenever Frost Titan becomes the target of a spell or ability an opponent controls, counter that spell or ability unless its controller pays {2}. ...

Morph {5}{U}{U} (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 Brine Elemental is ...

Morph {U} (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 Coral Trickster is turned...

Scry 4, then draw two cards.

Whenever Slith Strider becomes blocked, draw a card. Whenever Slith Strider deals combat damage to a player, put a +1/+1 counter on it.

Whenever you cast a creature spell, Halcyon Glaze becomes a 4/4 Illusion creature with flying in addition to its other types until end of turn.

Flying When Narcomoeba is put into your graveyard from your library, you may put it onto the battlefield.

Flying Cumulative upkeep—Discard a card. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay i...

Return target permanent to its owner's hand. Cycling {5}{W}{U}{B} ({5}{W}{U}{B}, Discard this card: Draw a card.) When you cycle Resounding Wave,...

Flying When Mulldrifter enters the battlefield, draw two cards. Evoke {2}{U} (You may cast this spell for its evoke cost. If you do, it's sacrifi...

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.) Draw two cards.

Defender, haste {T}: Draw a card, then discard a card.

Artifacts, creatures, and lands your opponents control enter the battlefield tapped.

Whenever a spell or ability you control counters a spell, you may create a 1/1 blue Merfolk creature token. Tap seven untapped Merfolk you control:...

Defender, haste {T}: Draw a card, then discard a card.

Morph {U} When Timebender is turned face up, choose one — • Remove two time counters from target permanent or suspended card. • Put two time counte...

Target player mills three cards. Flashback {1}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)