Starting with the number 1 or 0 (this is up to whoever starts the color off), the number must be on the card, but not in a mana cost or name. Next card uses the next number up until you hit 9 (or whatever), then go to the next color.

So if you were doing the number 3, you could have:
“Gain 3 life”
“Draw three cards”
A creature with power or toughness 3
A planeswalker with 3 starting loyalty, or a +3 or -3 loyalty ability

You could not have:
A card named “Three Mice”
A card with an activated ability that costs

Color order is as follows (though if players protest we could do the full nine color cycle like the rarity game)

White
Blue
Black
Red
Green
Multicolor and/or hybrid
Colorless and/or land


Starting off with white zero


Outpost -
Creature - Wall
Defender
: Target creature gains vigilance until end of turn.
”I can see my house from here!”
0/3

First Aid
Instant
Prevent the next one damage that would be dealt to each creature, planeswalker, and player this turn. Whenever damage is prevented this way, you gain 1 life.

Herding Cats -
Sorcery
Create two 2/2 white Cat creature tokens.
At the beginning of your next upkeep, sacrifice a creature unless you pay .

Terra Nullius -
Sorcery
Search your library for up to three Plains cards and exile them. You may play those cards for as long as they remain exiled.

Angie, the Bright Light -
Planeswalker - Angie
+5: Creatures you control get +1/+1 until end of turn.
-1: Your life total becomes equal to your starting life total.
-14: You get an emblem with “At the beginning of your end step, create a 5/5 white Angel creature token with flying.”
5

Lilliputian Revolt -
Sorcery
Exile target creature with power 6 or greater.
Creatures you control with power 1 or less get +2/+2 until end of turn.


Next is white 7

Seven Heaven
Sorcery (R)
You win the game if your life total is a multiple of 7. Otherwise, gain 7 life.

Steadfast Shieldmage
Creature - Human Wizard
: Switch target creature's toughness with Steadfast Shieldmage's toughness until end of turn.
0/8
"Teyo is an idiot if he thinks selflessness alone can save people. You can't protect anyone without power."
-Liliana Vess

Doctor X -
Legendary Creature - Human
Other creatures you control have lifelink.
As long as you control at least nine other creatures, other creatures you control have indestructible.
1/3

Blue zero


Phantasmal Wall -
Creature - Wall Illusion
Defender
When ~ enters the battlefield, draw a card.
When ~ becomes the target of a spell or ability, sacrifice it.
0/3

Counterecho -
Instant
Counter target spell. Two target tapped lands you control don't untap during your next untap step.

Wavemaker -
Creature - Kraken
When ~ enters the battlefield, return three target lands to their owners' hands.
2/7


Next is blue 4

Leyline of Contemplation
Enchantment (R)
If Leyline of Contemplation is in your opening hand and you have five or less cards in your hand, you may begin the game with it on the battlefield.
At the beginning of your draw step, draw a card, then discard a card.

Rabid Search -
Sorcery
Draw six cards, then discard six cards.
”It’s in here SOMEwhere!”

Top-Heavy -
Enchantment - Aura
Enchant creature with toughness 4 or less
When ~ enters the battlefield, tap enchanted creature.
Enchanted creature’s base power is 8.

Nonatutor -
Sorcery
Choose a card name. Look at the top nine cards of your library. You may reveal a card with the chosen name from among them and put it into your hand. Put the rest on the bottom of your library in a random order. If you didn’t reveal a card this way, draw a card.