Magical Hacker

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

"Ach! Hans, Run!"

At the beginning of your upkeep, you may say "Ach! Hans, run! It's the . . ." and the name of a creature card. If you do, search your library for a card with that name, put it onto the battlefield, then shuffle. That creature gains haste. Exile it at the beginning of the next end step.

Three-Headed Goblin

Triple strike (This creature deals first-strike, regular, and last-strike combat damage.)

Deadhead

{0}: Return Deadhead from your graveyard to the battlefield. Activate only if an opponent isn't touching their hand (of cards).

B.F.M. (Big Furry Monster)

B.F.M. onto the battlefield. If one B.F.M. card
more creatures.

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.

Ashnod's Coupon

{T}, Sacrifice Ashnod's Coupon: Target player gets you target drink. You pay any costs for the drink.

Mise

Choose a nonland card name, then reveal the top card of your library. If that card has the chosen name, you draw three cards.

Cardboard Carapace

Enchant creature
For each other card named Cardboard Carapace you have with you outside the game, enchanted creature gets +1/+1.

Uktabi Kong

Trample
When Uktabi Kong enters, destroy all artifacts.
Tap two untapped Apes you control: Create a 1/1 green Ape creature token.

Staying Power

"Until end of turn" and "this turn" effects don't end.

Cheatyface

If Cheatyface is in your hand, you may sneak Cheatyface onto the battlefield. If an opponent catches you right away, that player may exile Cheatyface.
Flying

Entirely Normal Armchair

During your turn, if Entirely Normal Armchair is in your hand, you may hide it on the battlefield.
{0}: Return Entirely Normal Armchair to its owner's hand. Only your opponents may activate this ability and only if they see Entirely Normal Armchair.
{2}, Sacrifice Entirely Normal Armchair: Destroy target attacking creature.

Ineffable Blessing

As Ineffable Blessing enters, choose a number.
Whenever a creature you control with exactly the chosen number of words in its name enters, draw a card. (Hyphenated words are one word.)

Clambassadors

Whenever Clambassadors deals damage to a player, choose an artifact, creature, or land you control. That player gains control of that permanent.

Mons's Goblin Waiters

Double Take

Choose another player. You draw two cards. At the beginning of the first upkeep in your next game with that player, you draw two cards.

Double Play

Choose another player. Search your library for a basic land card, put it onto the battlefield, then shuffle. At the beginning of the first upkeep in your next game with that player, search your library for a basic land card, put it onto the battlefield, then shuffle.

Necro-Impotence

Skip your untap step.
At the beginning of your upkeep, you may pay X life. If you do, untap X permanents.
Pay ½ life: Exile the top card of your library face down. Put that card into your hand at the beginning of the next end step.

Incoming!

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