Search your library and/or graveyard for a creature card with mana value X or less and put it onto the battlefield. If you search your library this way, shuffle. If X is 10 or more, creatures you control get +X/+X and gain haste until end of turn.

: Add .
Tap an untapped legendary permanent you control: Untap this artifact.

When this land enters, up to one target creature phases out.
: Add .
, : Add one mana of any color.
: Put this card from your hand onto the battlefield.

+1: Chandra deals 1 damage to target player or planeswalker and 1 damage to up to one target creature that player or that planeswalker's controller controls. That creature can't block this turn.
0: Exile the top card of your library. You may play it this turn.
−7: Exile the top ten cards of your library. Choose an instant or sorcery card exiled this way and copy it three times. You may cast the copies without paying their mana costs.

Reach, vigilance
Lumra's power and toughness are each equal to the number of lands you control.
When Lumra enters, mill four cards. Then return all land cards from your graveyard to the battlefield tapped.

Whenever an artifact you control enters, put a loyalty counter on Tezzeret.
0: Untap target artifact or creature. If it's an artifact creature, put a +1/+1 counter on it.
−3: Search your library for an artifact card with mana value 1 or less, reveal it, put it into your hand, then shuffle.
−7: You get an emblem with "At the beginning of combat on your turn, put three +1/+1 counters on target artifact you control. If it's not a creature, it becomes a 0/0 Robot artifact creature."

As an additional cost to cast this spell, sacrifice a green creature.
Search your library for a green creature card, put it onto the battlefield, then shuffle.

Equipped creature gets +2/+0 and has deathtouch.
: Until end of turn, this Equipment gains "Whenever equipped creature deals combat damage to a player, that player loses the game."
Equip

If a spell or ability would cause its controller to gain life, that player loses that much life instead.

As this land enters, you may reveal an Elemental card from your hand. If you don't, this land enters tapped.
: Add .
: Add one mana of any color. Spend this mana only to cast an Elemental spell or activate an ability of an Elemental.

Creatures entering don't cause abilities to trigger.

(: Add or .)
As this land enters, you may pay 2 life. If you don't, it enters tapped.

Vigilance
If a permanent entering causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.
Permanents entering don't cause abilities of permanents your opponents control to trigger.

Whenever a creature you control dies, each other player sacrifices a creature of their choice.

Flying, trample, indestructible, haste
Other artifact creatures you control have flying, trample, indestructible, and haste.

Flying
: Add one mana of any color.

Eminence — As long as The Ur-Dragon is in the command zone or on the battlefield, other Dragon spells you cast cost less to cast.
Flying
Whenever one or more Dragons you control attack, draw that many cards, then you may put a permanent card from your hand onto the battlefield.

When this creature enters, support 2. (Put a +1/+1 counter on each of up to two other target creatures.)
Whenever you put one or more counters on a creature you don't control, draw a card.

When this creature enters, you may search your library for an Equipment card, reveal it, put it into your hand, then shuffle.
, : You may put an Equipment card from your hand onto the battlefield.

(: Add or .)
As this land enters, you may pay 2 life. If you don't, it enters tapped.