New Mechanics

[AgrusKos]

Any new mechanics people can think of? Mine is

High Flying- can only be blocked by creatures with high flying or spiders

[Quackmaster5]

Juggernaut- can only be blocked by creatures with defender. Creatures with defender get -1/-1 for each other creature with juggernaut on the battlefield.

[Coffee Vampire]

Bean - to Bean, make a pot of coffee with 100% authentic coffee beans from paradise island. When the pot of coffee is made and taste tested for supreme maturity and taste, you win the game.

[Dudecore]

Counterspell (the spell you cast, and feel entitled to have it's effects resolve is countered. Remove it's effects from the stack and start complaining.)

Ethereal 3 (This permanemt is uncounterable, cannot be the target of spells or abilities. This permanent enters the battlefield with three time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)

[AgrusKos]

Tethered (This creature cannot be exiled).

Tethered+{Avacyn, Angel of Hope}

[Gorzo]

Tethered (This creature cannot be exiled).

I really like this idea. Would make for a really neat aura, too, if a keyword isn't your thing.

Planar Tether {2}{U}
Enchant permanent.
Planar Tether and enchanted permanent cannot be exiled.

[Xanzurth]

Countersecond: Countersecond does not use the stack. Counter target spell ignoring any non counterbility.

[Quackmaster5]

Tethered (This creature cannot be exiled).

I really like this idea. Would make for a really neat aura, too, if a keyword isn't your thing.

Planar Tether {2}{U}
Enchant permanent.
Planar Tether and enchanted permanent cannot be exiled.

Nice. Reminds me of {Diplomatic Immunity}...

Or {darksteel plate}

[Quackmaster5]

Mimic - when this creature enters the battlefield, it gains the abilities of any one creature on the battlefield.

[Gamedemon26]

Companionship: When this creature deals combat damage to a player, you may double that player's life total. If you do, double your life total.

[Elite621]

Russian Roulette - play this card without paying its casting cost, unless an opponent reveales a card from their hand with casting cost that is greater or equal to your card. If so, exile your card.

[AgrusKos]

Companionship: When this creature deals combat damage to a player, you may double that player's life total. If you do, double your life total.

I like that one

[Silent1236]

Companionship: When this creature deals combat damage to a player, you may double that player's life total. If you do, double your life total.

Infect + companionship for the lulz?