When this creature enters, switch upkeep steps with target opponent for as long as it remains on the battlefield. (You take your upkeep on their turn, and they take their upkeep on your turn.)

, : Put a +1/+1 counter on this creature.

This land enters tapped.
: Add or .

This land enters tapped unless you control two or more basic lands.

: Add .
: Add or . This land doesn't untap during your next untap step.

When this creature enters, you gain 2 life.
When this creature leaves the battlefield, draw a card.

This land enters tapped.
As this land enters, choose a color other than white.
: Add or one mana of the chosen color.

, : Search your library for a creature card with mana value X or less, reveal it, put it into your hand, then shuffle.

Whenever one or more other nontoken permanents with a name originally printed in the Arabian Nights expansion are on the battlefield, their controllers sacrifice them.
Players can't cast spells or play lands with a name originally printed in the Arabian Nights expansion.

City of Ass enters tapped.
: Add one and one-half mana of any one color.

Whenever this land becomes tapped, it deals 1 damage to you.
: Add one mana of any color.

, Exile a creature you control: Put a storage counter on this land.
: Add for each storage counter on this land.

Whenever you attack, target opponent loses X life, where X is the number of artifacts you control.

Whenever chaos ensues, for each opponent, you create a 3/3 black Dalek artifact creature token with menace that attacks that opponent this turn if able. Those tokens gain haste. Sacrifice them at the beginning of the next end step.

When you play another land, sacrifice this land.
: Add .

Trample
When you cast this spell and whenever this creature attacks, destroy up to one target nonland permanent. Its controller creates a tapped Powerstone token.
Unearth

Equipped creature gets +1/+0 for each of its colors.
Equip

Impossible Girl — If Clara Oswald is your commander, choose a color before the game begins. Clara Oswald is the chosen color.
If a triggered ability of a Doctor you control triggers, that ability triggers an additional time.
Doctor's companion (You can have two commanders if the other is the Doctor.)

When this Spacecraft enters, create two 1/1 colorless Borg artifact creature tokens.
Station — It's an artifact creature at 7+
7+: Flying
Artifact creatures you control get +1/+1.
4/4

: Add one mana of any color.
Station — It's an artifact creature at 6+
6+: Flying, vigilance
2/4

, Sacrifice a permanent: You gain 1 life.

, Roll a d8: Monstrosity X, where X is the result.
Berserk — When this creature becomes monstrous, destroy target permanent.

Flying
, Throw Clay Pigeon into the air at least two feet above your head while seated: If you catch Clay Pigeon with one hand, prevent all damage a source of your choice would deal to you this turn and tap Clay Pigeon. Otherwise, sacrifice it.

This creature enters tapped.
: Return this card from your graveyard to your hand.

: Regenerate this creature.