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cast > play since M10.
there is never caps with card's types.

Apart from these points I agree that your wording is better than mine. I'm still not sure it's good enough.

Walk on your face W
Instant
As an additional cost to cast Walk on your face, sacrifice a planeswalker.
Choose an ability of this planeswalker and play it.

Not sure about the wording.

Bisounours Tower %5
Artifact
Players can't lose the game.

I agree. It's offensive, misleading and inappropriate.

too strong with vial

http://magiccards.info/scans/en/pr/19.jpg

Fairbond seems really strong.

4*FoW + 4*Misdirection + 4*Progenitus + 4*Show and Tell + 4*Willing Sorcerer looks like a fine basis for a deck.

In combo with Reflect Damage (or Jade Monolith + Lure).

It looks awful. It takes 1 turn to be effective. I really don't see in which deck you would like to play this.

Erasure WWW
Instant
Exile target non-land permanent. Its controller gains life equal to its converted casting cost.

Now we've got a 0/0, or at best a 1/1 you spent G. By the way the 1 in the CC is absolutely irrelevant. As it is worded it is still too strong: tutorable with trinket mage, and a 2/2 for G, a 1/1...

If it was 0/0 instead of X/X and if it was something else than persist for green (can't be countered lol) though it would be a nice card. Maybe still too strong.

My favorite is 1BWU, 3/3 flying,...

It's X/X and it gains a counter +1/+1 per color used to pay. So we are not reading the same no.

So for UB, you have a 4/4 Flying, Lifelink. For UBG, you'll have a 6/6 Flying, Lifelink, Persist (which is dumb because it'll come back as a 0/0 creature with a -1/-1 counter).
For {1}, you have a...

Can you explain how my template is wrong? I'd like to understand. For memory it was:

Players can't pay sacrifice costs.

If they can't pay, thay can't play. And "players can't sacrifice...

In a more compact way:
Players can't pay sacrifice costs.

That's just broken alone, since nobody can even get any mana and you've got a 4/6 into play...

Other than that, if you say non-land permanents, if you make it 1/4 in order for it to be out of...

Preventing draws is far better than discard. Why was plow under considered good before fetches appeared? Why does Chittering Rats costs B more than Ravenous Rats? (I help, it's not because it has...

Yeah. Let me take back what I said. You're a bad designer after all ^^.

The wording could be:
Opponents can't discard.
If a spell or ability an opponent controls would cause you to discard a...

I really thought it was sarcasm. I found it funny. I'm sad it wasn't.

And yes, Barook is the best card designer of this thread. I had already noticed it.

It'd be far better than llanowar, which is already considered as really good. Cheating on land plays is really strong. Elfball and survival elves would probably be much better than they are...

Definitely too strong. But if you change it with "each player may search..." or "... put it into your hand", it looks balanced.

IslandWalker UUU
+1: target land becomes an island in addition its other types (NOT until end of turn)
-1: target merfolk gains islandwalk and gains "whenever ~ deals combat damage to a player, you...

Tribal Planeswalker (but better than Nissa Revane and with the tribal type and the tribe's subtype) would be interesting too.

But a colorless basic seems very interesting:

Factory
Basic Land: Factory
Factory comes into play tapped.
{T}: Add {2} to your mana pool.