When Nissa, Vastwood Seer enters the battlefield, you may search your library for a basic Forest card, reveal it, put it into your hand, then shuffle your library.
Whenever a land enters the battlefield under your control, if you control seven or more lands, exile Nissa, then return her to the battlefield transformed under her owner's control.

[+1]: Untap target land you control. Until your next turn, it becomes a 5/5 Elemental creature with haste. It's still a land.
[−3]: Return target permanent card from your graveyard to your hand.
[−6]: You get an emblem with "Whenever a land enters the battlefield under your control, you may draw a card."

[+1]: Create a 0/1 green Plant creature token.
[−2]: Put a +1/+1 counter on each creature you control.
[−7]: You gain X life and draw X cards, where X is the number of lands you control.

[+1]: Target land you control becomes a 4/4 Elemental creature with trample. It's still a land.
[+1]: Untap up to four target Forests.
[−7]: Search your library for any number of basic land cards, put them onto the battlefield, then shuffle your library. Those lands become 4/4 Elemental creatures with trample. They're still lands.

Flying
When Niv-Mizzet Reborn enters the battlefield, reveal the top ten cards of your library. For each color pair, choose a card that's exactly those colors from among them. Put the chosen cards into your hand and the rest on the bottom of your library in a random order.

Flying
Whenever Niv-Mizzet, Dracogenius deals damage to a player, you may draw a card.
: Niv-Mizzet, Dracogenius deals 1 damage to any target.

Whenever Novablast Wurm attacks, destroy all other creatures.

Menace
When Noxious Gearhulk enters the battlefield, you may destroy another target creature. If a creature is destroyed this way, you gain life equal to its toughness.

Hexproof
You can't cast noncreature spells.
: Nullhide Ferox loses all abilities until end of turn. Any player may activate this ability.
If a spell or ability an opponent controls causes you to discard Nullhide Ferox, put it onto the battlefield instead of putting it into your graveyard.

Indestructible
As long as your devotion to green is less than five, Nylea isn't a creature. (Each in the mana costs of permanents you control counts toward your devotion to green.)
Other creatures you control have trample.
: Target creature gets +2/+2 until end of turn.

Indestructible
As long as your devotion to green is less than five, Nylea isn't a creature.
Creature spells you cast cost less to cast.
: Reveal the top card of your library. If it's a creature card, put it into your hand. Otherwise, you may put it into your graveyard.

Trample
If you tap a permanent for mana, it produces three times as much of that mana instead.

Flying, trample
Whenever O-Kagachi, Vengeful Kami deals combat damage to a player, if that player attacked you during their last turn, exile target nonland permanent that player controls.

[+1]: You draw a card and you lose 1 life.
[−3]: Destroy target creature.
[−8]: Target opponent gets an emblem with "Whenever a player draws a card, you lose 2 life."

[+2]: Each opponent loses 1 life. You gain life equal to the life lost this way.
[−2]: Create a 5/5 black Demon creature token with flying. You lose 2 life.
[−8]: You get an emblem with ", Sacrifice a creature: You gain X life and draw X cards, where X is the sacrificed creature's power."
Ob Nixilis of the Black Oath can be your commander.

Landfall — Whenever a land enters the battlefield under your control, you may have target player lose 3 life. If you do, put three +1/+1 counters on Ob Nixilis, the Fallen.

When you cast this spell, target opponent exiles the top four cards of their library, then you may put any number of land cards that player owns from exile onto the battlefield under your control.

: Put a blaze counter on target land without a blaze counter on it. For as long as that land has a blaze counter on it, it has "At the beginning of your upkeep, this land deals 1 damage to you." (The land continues to burn after Obsidian Fireheart has left the battlefield.)

At the beginning of combat on your turn, up to one target land you control becomes an X/X Elemental creature with trample and haste until end of turn, where X is Obuun's power. It's still a land.
Landfall — Whenever a land enters the battlefield under your control, put a +1/+1 counter on target creature.

When Obzedat, Ghost Council enters the battlefield, target opponent loses 2 life and you gain 2 life.
At the beginning of your end step, you may exile Obzedat. If you do, return it to the battlefield under its owner's control at the beginning of your next upkeep. It gains haste.