Spooky20

{1}: Flip a coin. If you win the flip, add {C}{C}. Activate only as an instant.

{U}: Change the text of target spell or permanent by replacing all instances of + with -, and vice versa, until end of turn.

Flying Spells cast by players wearing at least one item of women's clothing cost {1} less to cast. (You can define women's clothing as you see fit....

Destroy target nonblack creature. Gotcha — If an opponent says "kill" or "destroy," you may say "Gotcha!" When you do, return Kill! Destroy! from y...

You and target opponent play Seven Questions with the top card of that player's library. If you win, prevent all damage that would be dealt this tu...

You gain life equal to your age.

As this creature enters, an opponent chooses one of your fingers. (Thumbs are fingers, too.) When the chosen finger isn't touching this creature, s...

Each attacking or blocking creature with the lowest collector number among attacking or blocking creatures has first strike.

You and target creature's controller have a staring contest. If you win, destroy that creature.

Whenever another creature enters, you may stand up and say in a deep, booming voice, "Presenting . . . " and that creature's name. If you do, put a...

Elvish House Party's power and toughness are each equal to the current hour, using the twelve-hour system.

Whenever you gain life, put two +1/+1 counters on this creature. {3}{W}: Put a loyalty counter on target Gideon planeswalker.

Whenever you cast a noncreature spell, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind al...

This artifact enters tapped. {T}: Add two mana of different colors.

Landfall — Whenever a land you control enters, proliferate. (Choose any number of permanents and/or players, then give each another counter of each...

This creature enters tapped. Whenever this creature attacks, you may pay {2}{B}. If you do, return target creature card from your graveyard to your...

When this creature enters, amass Zombies 2. (Put two +1/+1 counters on an Army you control. It's also a Zombie. If you don't control an Army, creat...

{T}: Add {G}{G}. Whenever a nontoken creature enters the battlefield under your control, put a +1/+1 counter on it.

Ward—You get two poison counters. Annihilator X, where X is the total number of poison counters your opponents have. When you cast That Which Was C...

Team Cloudspire — Target creature gets +2/+0 and gains indestructible until end of turn. Draw a card. Team Speed Demons — Return one or two target ...

When Team Mage enters, search you library for an artifact card with mana value 4 or greater if you're on Team Cloudspire or an artifact card with m...

Team Cloudspire — Create two 1/1 white Warrior creature tokens. Team Speed Demons — Search your library for a basic land card, put it onto the batt...

Creatures get -X/-X until end of turn, where X is your highest commander tax among your commanders. (For example, if you've cast your one commander...

Tax Keeper gets +X/+X, where X is your highest commander tax among your commanders. (For example, if you've cast your one commander from your comma...