Awesome Cyber Monday

As an additional cost to cast this spell, sacrifice a creature. Add an amount of {B} equal to the sacrificed creature's converted mana cost.

At the beginning of the end step, if no creatures are on the battlefield, sacrifice Pestilence. {B}: Pestilence deals 1 damage to each creature and...

Enchant land At the beginning of the upkeep of enchanted land's controller, Cursed Land deals 1 damage to that player.

Remove Contract from Below from your deck before playing if you're not playing for ante. Discard your hand, ante the top card of your library, then...

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

First strike (This creature deals combat damage before creatures without first strike.) Protection from white (This creature can't be blocked, targ...

Black creatures get +1/+1.

Defender (This creature can't attack.) {U}: Wall of Water gets +1/+0 until end of turn.

Defender, flying (This creature can't attack, and it can block creatures with flying.)

{1}: The next time a black source of your choice would deal damage to you this turn, prevent that damage.

Destroy X target Mountains. Volcanic Eruption deals damage to each creature and each player equal to the number of Mountains put into a graveyard t...

You may have Vesuvan Doppelganger enter the battlefield as a copy of any creature on the battlefield, except it doesn't copy that creature's color ...

Return target creature to its owner's hand.

Enchant creature Enchanted creature gets +3/+3. At the beginning of the upkeep of enchanted creature's controller, put a -1/-1 counter on that crea...

Target spell or permanent becomes blue. (Mana symbols on that permanent remain unchanged.)

Enchant artifact You control enchanted artifact.

Players skip their untap steps. At the beginning of your upkeep, sacrifice Stasis unless you pay {U}.

Counter target spell with converted mana cost X. (For example, if that spell's mana cost is {3}{U}{U}, X is 5.)

Change the text of target spell or permanent by replacing all instances of one color word with another. (For example, you may change "target black ...

Cast this spell only during an opponent's turn, before attackers are declared. Creatures the active player controls attack this turn if able. At th...

Untapped creatures you control get +0/+2.

Flying At the beginning of your upkeep, Serendib Efreet deals 1 damage to you.

Sea Serpent can't attack unless defending player controls an Island. When you control no Islands, sacrifice Sea Serpent.