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

Return all artifacts target player owns to their hand.

Whenever another nontoken artifact you control enters, you may pay . If you do, create a token that's a copy of it. If the token isn't a creature, it becomes a 2/2 Robot Villain creature in addition to its other types.

Thranduil has all activated abilities of all Elf cards in your graveyard.
Whenever another legendary Elf you control enters, draw two cards, then discard a card.

Flying
Whenever one or more creatures deal combat damage to you, each opponent sacrifices a creature of their choice that dealt combat damage to you this turn. The Ring tempts you.
Discard a card: Witch-king of Angmar gains indestructible until end of turn. Tap him.

As an additional cost to cast this spell, pay X life.
All creatures get -X/-X until end of turn.

Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)
When this creature enters, draw a card.

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

Artifacts and enchantments you control have shroud. (They can't be the targets of spells or abilities.)

You may activate loyalty abilities of Teferi on any player's turn any time you could cast an instant.
+1: Draw a card, then discard a card.
−3: Target creature you don't control phases out. (Treat it and anything attached to it as though they don't exist until its controller's next turn.)
−10: Take two extra turns after this one.

Flash
When this creature enters, copy target instant or sorcery spell. You may choose new targets for the copy.

At the beginning of each player's upkeep, that player discards a card at random.

Elves you control have "Whenever this creature becomes tapped during your turn, untap it and put a +1/+1 counter on it. This ability triggers only once each turn."

: Add .
, , Sacrifice this land: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

: Add one mana of any color in your commander's color identity.

Sacrifice an artifact: Add .

Return target creature card with mana value 3 or less from your graveyard to the battlefield.
Cycling (, Discard this card: Draw a card.)

Draw cards equal to the number of cards in your library, then put a card from your hand on top of your library. You have no maximum hand size until your next turn.

, Discard a card: Create a 1/1 green Saproling creature token. Any player may activate this ability.

Each player chooses from among the permanents they control an artifact, a creature, an enchantment, and a land, then sacrifices the rest.