Ward—Discard an enchantment, instant, or sorcery card.
Whenever you cast your second spell each turn, each opponent mills two cards. When one or more cards are milled this way, exile target enchantment, instant, or sorcery card with equal or lesser mana value than that spell from an opponent's graveyard. Copy the exiled card. You may cast the copy without paying its mana cost.

Knight creatures you control have double strike.

Whenever another permanent you control becomes the target of a spell or ability an opponent controls, you may return that permanent to its owner's hand.

Start your engines!
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Max Speed — , : Mill seven cards. Choose a playtest card from among them. You may cast it without paying its mana cost. If Team Cloudspire won the race, copy it and you may choose new targets for the copy. If Team Speed Demons won the race, each opponent loses life equal to its mana value.
The Mystery Raceway can be your commander.

: Creatures you control get +1/+0 and gain haste until end of turn.
When this creature enters, discard any number of cards, then draw that many cards.
When this creature dies, it deals X damage to each opponent and each planeswalker they control, where X is the number of land cards in your graveyard.

Enchant creature
As long as enchanted creature is green, it gets +1/+1 and has indestructible. (Damage and effects that say "destroy" don't destroy it. If its toughness is 0 or less, it still dies.)
As long as enchanted creature is white, it gets +1/+1 and has flying.

Destroy all creatures. They can't be regenerated.

Flying, trample
Shroud (This creature can't be the target of spells or abilities.)

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: Add or . This land deals 1 damage to you.

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Exile the top card of your library. You may put that card into your hand unless it has the same name as another card exiled this way. Repeat this process until you put a card into your hand or you exile two cards with the same name, whichever comes first.

As this enchantment enters, choose a creature type.
Creatures you control are the chosen type. The same is true for creature spells you control and creature cards you own that aren't on the battlefield.

: Destroy target tapped creature.

Whenever you cast an enchantment spell, you may draw a card.

Lord of Extinction's power and toughness are each equal to the number of cards in all graveyards.

When General Tazri enters, you may search your library for an Ally creature card, reveal it, put it into your hand, then shuffle.
: Ally creatures you control get +X/+X until end of turn, where X is the number of colors among those creatures.

Creatures can't block.
Whenever chaos ensues, draw a card for each land you control.

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Sacrifice a creature: Add .

When this artifact enters, create three Food tokens.
: Add for each Food you control.