Alpha Guard

When Alpha Guard enters the battlefield, choose a letter.
{T}: Untap another target permanent whose name starts with the chosen letter.

Over My Dead Bodies

Creature cards in graveyards can attack and block as though they were on the battlefield, can block or be blocked only by creature cards in graveyards, are Zombies in addition to their other types, and have undeathtouch. (If they would deal damage to a creature card, exile that creature card instead.)
Creature cards in your graveyard have haste.

Checks and Balances

Cast this spell only if there are three or more players in the game.
Whenever a player casts a spell, each of that player's opponents may discard a card. If they do, counter that spell.

Killer Cosplay

Whenever Killer Cosplay becomes attached to a creature, choose a creature card name with an identical mana cost. That creature becomes a copy of the card with the chosen name until Killer Cosplay becomes unattached from it.
Equip {3}

Baron Von Count

Baron Von Count enters the battlefield with a doom counter on "5."
Whenever you cast a spell with the indicated numeral in its mana cost, text box, power, or toughness, move the doom counter one numeral to the left.
When the doom counter moves from "1," destroy target player and put that doom counter on "5."

Goblin Tutor

Roll a six-sided die. If you roll a 1, Goblin Tutor has no effect. Otherwise, search your library for the indicated card, reveal it, put it into your hand, then shuffle.
2 — A card named Goblin Tutor
3 — An enchantment
4 — An artifact
5 — A creature
6 — An instant or sorcery

Burning Cinder Fury of Crimson Chaos Fire

Whenever any player taps a permanent, that player chooses one of their opponents. The chosen player gains control of that permanent at the beginning of the next end step.
At the beginning of each player's end step, if that player didn't tap any nonland permanents that turn, Burning Cinder Fury of Crimson Chaos Fire deals 3 damage to that player.

Nearby Planet

Rangeling (This card is every land type, including Plains, Island, Swamp, Mountain, Forest, Desert, Gate, Lair, Locus, and all those Urza's ones.)
Nearby Planet enters the battlefield tapped.
When Nearby Planet enters the battlefield, sacrifice it unless you pay {1}.

Common Courtesy

Whenever a player casts a spell without asking your permission while casting it, counter that spell.
When a player asks you permission to cast a spell and you refuse, counter that spell and sacrifice Common Courtesy.

Sole Performer

{T}: Add {T}{T}. Activate only once each turn. (While activating an ability, use {T} rather than tapping the permanent to pay for {T}.)

Crow Storm

Create a 1/2 blue Bird creature token with flying named Storm Crow.
Storm (When you cast this spell, copy it for each spell cast before it this turn.)

Organ Harvest

Your team may sacrifice any number of creatures. For each creature sacrificed this way, you add {B}{B}.

Once More with Feeling

Exile all permanents and all cards from all graveyards. Each player shuffles their hand into their library, then draws seven cards. Each player's life total becomes 10. Exile Once More with Feeling.
DCI ruling — A deck can have only one card named Once More with Feeling.

Strategy, Schmategy

Roll a six-sided die. Strategy, Schmategy has the indicated effect.
1 — Do nothing.
2 — Destroy all artifacts.
3 — Destroy all lands.
4 — Strategy, Schmategy deals 3 damage to each creature and each player.
5 — Each player discards their hand and draws seven cards.
6 — Repeat this process two more times.

Gray Merchant of Alphabet

When Gray Merchant of Alphabet enters the battlefield, choose a letter. For each creature you control that has the chosen letter in its name, you gain 1 life and each opponent loses 1 life.

Symbol Status

Create a 1/1 colorless Expansion-Symbol creature token for each different expansion symbol among permanents you control.

Form of the Squirrel

As Form of the Squirrel enters the battlefield, create a 1/1 green Squirrel creature token. You lose the game when that creature leaves the battlefield.
Creatures can't attack you.
You have shroud.
You can't cast spells.

Incoming!

Each player searches their library for any number of artifact, creature, enchantment, and/or land cards, puts them onto the battlefield, then shuffles.

Trigger Happy

Choose a triggered ability of target permanent. It triggers. You control that ability.

Mana Flair

Add {R} for each nonland permanent with art by the artist of your choice.

Framed!

Choose an artist. Tap all untapped permanents with art by that artist or untap all tapped permanents with art by that artist.