My restriction: A card's rules text can't use the Xth letter of the alphabet, where X is that card's converted mana cost. For example, my card has CMC 4, so I can't use the letter D anywhere in the rules text.
Mistful Phantasm2WU
Creature - Spirit (u)
Flying
Other attacking and blocking creatures you control have Hexproof.
3/3
Didn't you break your own restriction?
I guess I'll try this out. Restriction: The design can't incorporate odd numbers in its converted mana cost, power and toughness, or number of colors (meaning that it must have 0, 2, or 4 colors).
Flameborn Sire4RW
Creature- Phoenix (R)
Flying
When Flameborn Sire dies, put a 0/4 white egg creature token with defender onto the battlefield. When that creature leaves the battlefield, you may pay RW. If you do, return a phoenix card from your graveyard to the battlefield.
6/2
Constricted Breathing1WW
Enchantment (R)
Whenever you cast a spell, until the beginning of your next upkeep, spells that share a card type with that spell cost 1 more to cast.
Pathbender3UU
Creature- Vedalken Wizard (M)
If an opponent would cast a creature spell, instead that player exiles that spell with a time counter on it. If it doesn't have suspend, it gains suspend. 2UU,T, Return a land an opponent controls to that player's hand: Put a time counter on target suspended card that player owns.
0/4
Varlan the Grower3GU
Planeswalker- Varlan (M)
[+1] Choose up to three target creatures. Put a +1/+1 counter on each of them.
[-2] For each counter on target permanent, put another of those counters on that permanent.
[-20] For each creature you control, put a token into play that's a copy of that creature.
{4}
Solizan, the Shielding Light3WW
Legendary Creature- Spirit (M)
Defender
Solizan, the Shielding Light can block any number of creatures.
Whenever Solizan blocks a creature, Solizan gets +0/+1 until end of turn.
Non-spirit creatures you control get +X/+X, where X is Solizan, the Shielding Light's toughness.
0/5
Barash, Hero of Irrora
Legendary Creature- Human Knight
If Barash, Hero of Irrora is in your opening hand or in the command zone, you may begin the game with it on the battlefield.
Level up WU
Level 0-3: Hexproof
1/1
Level 4+: First strike, Vigilance, Hexproof
6/6
Next: Design a commander that cares about exiled cards.
Thought PyreXYUR
Instant (R)
Thought Pyre deals X damage to target player. That player puts the top Y cards of his or her library into his or her graveyard.
I've never done one of these before, so I'm not sure what I'm getting myself into, but here goes. Colors: WU
Lands:
1x Plains
1x Island
Creatures:
2x Merfolk
4x Soldier
Solwater Respite
Land (R)
Solwater Respite enters the battlefield tapped.
When you control no creatures, sacrifice Solwater Respite. T: Add W to your mana pool. You gain 1 life. T: Add U to your mana pool. Look at the top card of your library.
Art:
Travelers kneel on verdant green grass around a spring with a faint golden glow. The light from the spring illuminates the room.
Thousand-Hand AsuraRRR
Creature- Spirit Monk (R)
Double Strike
Whenever Thousand-Hand Asura blocks or becomes blocked by a creature, it deals 2 damage to that creature.
At end of combat, Thousand-Hand Asura deals 2 damage to each creature it dealt combat damage to this turn.
2/2
Sphinx of the Nightmists4UU
Night Creature- Sphinx (M)
Flying
Whenever a creature attacks you, declare artifact, creature, enchantment, instant, or sorcery. That creature's controller reveals the top card of his or her library, then puts it on the bottom of his or her library. If the revealed card was the declared type, that creature becomes blocked.
3/5
Treasured PrinceW
Creature- Human Advisor (C)
Treasured (If you would search your library for exactly one card and this card is in your library, you may find this card instead.)
0/2
I would have to say that Gilder Bairn is my favorite Magic card. It's the card I built my first ever combo deck around, a deck my friends came to loath.
Didn't you break your own restriction?
I guess I'll try this out.
Restriction: The design can't incorporate odd numbers in its converted mana cost, power and toughness, or number of colors (meaning that it must have 0, 2, or 4 colors).
Flameborn Sire 4RW
Creature- Phoenix (R)
Flying
When Flameborn Sire dies, put a 0/4 white egg creature token with defender onto the battlefield. When that creature leaves the battlefield, you may pay RW. If you do, return a phoenix card from your graveyard to the battlefield.
6/2
Enchantment (R)
Whenever you cast a spell, until the beginning of your next upkeep, spells that share a card type with that spell cost 1 more to cast.
Creature- Vedalken Wizard (M)
If an opponent would cast a creature spell, instead that player exiles that spell with a time counter on it. If it doesn't have suspend, it gains suspend.
2UU,T, Return a land an opponent controls to that player's hand: Put a time counter on target suspended card that player owns.
0/4
Planeswalker- Varlan (M)
[+1] Choose up to three target creatures. Put a +1/+1 counter on each of them.
[-2] For each counter on target permanent, put another of those counters on that permanent.
[-20] For each creature you control, put a token into play that's a copy of that creature.
{4}
Legendary Creature- Spirit (M)
Defender
Solizan, the Shielding Light can block any number of creatures.
Whenever Solizan blocks a creature, Solizan gets +0/+1 until end of turn.
Non-spirit creatures you control get +X/+X, where X is Solizan, the Shielding Light's toughness.
0/5
Barash, Hero of Irrora
Legendary Creature- Human Knight
If Barash, Hero of Irrora is in your opening hand or in the command zone, you may begin the game with it on the battlefield.
Level up WU
Level 0-3: Hexproof
1/1
Level 4+: First strike, Vigilance, Hexproof
6/6
Next: Design a commander that cares about exiled cards.
Instant (R)
Thought Pyre deals X damage to target player. That player puts the top Y cards of his or her library into his or her graveyard.
Next: XX2
Creature- Plant Homunculus (U)
Whenever counters are placed on another permanent, you may put a +1/+1 counter on Varlan's Mimic.
2/2
Timeless Elucidation
Colors:
WU
Lands:
1x Plains
1x Island
Creatures:
2x Merfolk
4x Soldier
Solwater Respite
Land (R)
Solwater Respite enters the battlefield tapped.
When you control no creatures, sacrifice Solwater Respite.
T: Add W to your mana pool. You gain 1 life.
T: Add U to your mana pool. Look at the top card of your library.
Art:
Travelers kneel on verdant green grass around a spring with a faint golden glow. The light from the spring illuminates the room.
Creature- Spirit Monk (R)
Double Strike
Whenever Thousand-Hand Asura blocks or becomes blocked by a creature, it deals 2 damage to that creature.
At end of combat, Thousand-Hand Asura deals 2 damage to each creature it dealt combat damage to this turn.
2/2
Night Creature- Sphinx (M)
Flying
Whenever a creature attacks you, declare artifact, creature, enchantment, instant, or sorcery. That creature's controller reveals the top card of his or her library, then puts it on the bottom of his or her library. If the revealed card was the declared type, that creature becomes blocked.
3/5
Instant (R)
Choose a non-legendary permanent on the battlefield. Target permanent becomes a copy of that permanent until end of turn.
Creature- Human Advisor (C)
Treasured (If you would search your library for exactly one card and this card is in your library, you may find this card instead.)
0/2