Boxing Day

Each creature you control that's a Wolf or a Werewolf enters the battlefield with an additional +1/+1 counter on it. [-2]: Create a 2/2 green Wolf...

Your opponents can't gain life. [-2]: Create a 1/1 red Devil creature token with "When this creature dies, it deals 1 damage to any target."

Whenever a creature attacks you or a planeswalker you control, each Dragon you control deals 1 damage to that creature. [+1]: Until end of turn, ea...

If another red source you control would deal damage to a permanent or player, it deals that much damage plus 1 to that permanent or player instead....

Whenever one or more loyalty counters are removed from Chandra, Fire Artisan, she deals that much damage to target opponent or planeswalker. [+1]: ...

Whenever an opponent draws a card, Ob Nixilis, the Hate-Twisted deals 1 damage to that player. [-2]: Destroy target creature. Its controller draws ...

Whenever a creature you control dies, draw a card. [+1]: Create a 2/2 black Zombie creature token. [-4]: Each player sacrifices two creatures. [-9]...

At the beginning of each opponent's upkeep, if that player has one or fewer cards in hand, Davriel, Rogue Shadowmage deals 2 damage to them. [-1]:...

Each opponent can't draw more than one card each turn. [-2]: Look at the top four cards of your library. You may reveal a noncreature, nonland car...

Spells your opponents cast that target a creature or planeswalker you control cost {2} more to cast. [-2]: Create a 2/2 blue Wizard creature token....

If you would draw a card while your library has no cards in it, you win the game instead. [+1]: Target player mills two cards. Draw a card. [-8]: D...

Prevent all noncombat damage that would be dealt to you and other permanents you control. [-2]: Exile target creature with power 4 or greater.

You have hexproof. (You can't be the target of spells or abilities your opponents control.) [-2]: Create a 0/3 white Wall creature token with defe...

As long as it's your turn, Gideon Blackblade is a 4/4 Human Soldier creature with indestructible that's still a planeswalker. Prevent all damage t...

Colorless spells you cast cost {2} less to cast. [+1]: Exile the top card of your library face down and look at it. Create a 2/2 colorless Spirit ...

Activated abilities of artifacts your opponents control can't be activated. [+1]: Until your next turn, up to one target noncreature artifact beco...

[+1]: Mill three cards. If at least one Zombie card is milled this way, each opponent loses 2 life and you gain 2 life. [-2]: Target creature gets ...

[+4]: Target player exiles a card from their hand. [-3]: Exile target permanent. [-14]: Restart the game, leaving in exile all non-Aura permanent c...

[+1]: Create two 3/1 red Elemental creature tokens with haste. Exile them at the beginning of the next end step. [0]: Discard all the cards in your...

[+1]: Create two 3/1 red Elemental creature tokens with haste. Exile them at the beginning of the next end step. [0]: Discard all the cards in your...

[+1]: Untap up to two target artifacts. [-X]: Search your library for an artifact card with mana value X or less, put it onto the battlefield, then...

[+1]: Untap two target lands. [−1]: Create a 3/3 green Beast creature token. [−4]: Creatures you control get +3/+3 and gain trample until end of turn.

[+1]: Head to AskUrza.com and click +1. [-1]: Head to AskUrza.com and click -1. [-6]: Head to AskUrza.com and click -6.

[+1]: Tap target permanent, then untap another target permanent. [−2]: Ral Zarek deals 3 damage to any target. [−7]: Flip five coins. Take an extra...