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With this:

Potential {mana} - You may cast this creature for its Potential cost. If you do, add {mana} to your mana pool.


Some examples.

Fallen Imp  
Creature - Demon

Potential
Haste

1/1

Large Shield Gladiator
Creature - Human

Potential
Vigilance

1/4

--

Fiendish Plant
Creature - Demon

Potential
Whenever ~ blocks a creature with toughness equal to or lower than its power, it can block again during the same battlephase.

3/3

--

Charged Abomination
Creature - Undead

Potential
Infect
When Charged Abomination dies, proliferate.

4/1

--

Entropomancer
Creature - Human Wizard

Potential
: Target instant or sorcery that requires a target changes its target randomly.
During your draw phase, you may place one card from your hand in your library, shuffle, then draw 1 card.

4/6

--

Dragon of the Justicar
Creature - Dragon

Potential
Flying
: Return target creature that dealt damage this turn to its owner's hand.
: Detain target permanent.

3/3

Defining potential is going to be tricky.

As written artifacts that I could sacrifice for mana count towards it. And I don't have to sacrifice them.

Seems like it'd be better to just require a certain set of basic land types; Would be significantly harder to meet, but then you are giving the card away for free.

Of course, that wouldn't break Chromatic Lantern... 

Nov 12, 2012 -- 2:17AM, Kingreaper wrote:

Defining potential is going to be tricky.

As written artifacts that I could sacrifice for mana count towards it. And I don't have to sacrifice them.

I was thinking more on the lines of - sacrifice for mana, then you can cast this but the mana is not gone. Or like if you have 6 creatures and use Battle Hymn you can cast the dragon for freezies, but not if it stays in your hand.

Seems like it'd be better to just require a certain set of basic land types; Would be significantly harder to meet, but then you are giving the card away for free.

Of course, that wouldn't break Chromatic Lantern... 

Yep. Also, it'd be slow.

No, wait! I know exactly how to word it. Check the OP.

Yeah, that works fine. You spend the mana, and then get it right back. I quite like it; it's not quite free, but it's close (if you can spend the mana usefully on something else then it is free) and it's not broken-in-half like the Free mechanic was. 

It's a mechanic to be careful with, but would be very cool to play with :-). 

It would definitely be fun to play with. Right after Chromatic Lantern is banned, that is.

Potential {mana} - You may cast this creature for its Potential cost. If you do, gain {mana}.

Should be

Potential {mana} - You may cast this creature for its Potential cost. If you do, add {mana} to your mana pool.

"gains mana" currently has no meaning with respect to MtG rules, unless I'm missing something. 

It goes without saying, of course, that this would be almost hilariously busted with storm. 

So, wait, let me get this straight. The Potential mechanic just adds mana to your mana pool equal to what you paid for the creature? So you basically got it for free, just so you have mana to cast other things.

I really don't get it's purpose, unless it's MEANT to be in a storm centric, or an aggro centric environment where windmill slamming your hand on the table is the key to victory.

EDIT: Oh yeah, it reminds me of priest of urabrask .

Actually, this very well balanced in comparison to the Urza free mechanic, as it requires you to cast/pay the potential cost before getting free mana back.

Why is this a big deal? Well, let's ask Mr. Whale and Mr. Nightmare !

Nov 12, 2012 -- 10:39PM, EpicLevelCommoner wrote:

Actually, this very well balanced in comparison to the Urza free mechanic, as it requires you to cast/pay the potential cost before getting free mana back.

Why is this a big deal? Well, let's ask Mr. Whale and Mr. Nightmare !

it also makes you use it immediately, and can't be used with lands that make multiple mana to generate mana.

 

@TRM: thanks, fixed.

Yeah, the free mechanic was pretty cheese. This is much more sane. 

Nov 12, 2012 -- 2:05AM, Esterdi wrote:

Entropomancer
Creature - Human Wizard

Potential
: Target instant or sorcery that requires a target changes its target randomly.
During your draw phase, you may place one card from your hand in your library, shuffle, then draw 1 card.

4/6

I think this would be better worded as:

"At the beginning of your draw step, you may put a card from your hand on top of your library. If you do, shuffle your library, then draw a card."

The target change ability also needs reworking, but I'm not sure how to do it without having a bunch of "target"s in the ability, which could cause some serious confusion. Case in point:

": Change the target of target instant or sorcery spell with a single target to a random target."

Sorcery
Potential .


Artifact Creature
Potential .
4/4

Duel Decks: Chromatic Lantern vs. Lantern of Insight

Whoah, Lantern of Insight seems powerful.

Nov 13, 2012 -- 9:36AM, alan2here wrote:

Whoah, Lantern of Insight seems powerful.

It's not a miracle, but it warns you about one.

I take it back, it's not what I thought. Revealed dosn't mean you can play it.