When Moving Mountains enters, search your library for a land card, put it onto the battlefield tapped, then shuffle.
If a Ruin you control would stop being a creature, it becomes a creature in addition to its other types for as long as you control Moving Mountains.

Whenever one or more cards leave your graveyard, you gain 2 life. This ability triggers only once each turn.

Flash
When Narzi, Hero of the Mokar enters, up to one other target creature gets +1/+1 and gains indestructible until end of turn. If she wandered, other creatures you control get +1/+1 and gain indestructible until end of turn instead.
Wander {4}{W}{W}

Trample, ward {4}
Equipped creature gets +4/+4 and has trample and ward {4}.
Equip {4}
Spellcharge 8

Whenever another creature you control enters, you gain 2 life.

If you would gain life, you gain that much life plus 1 instead.
If one or more tokens would be created under your control, those tokens plus a 0/1 white Goat creature token are created instead.

Whenever Opal-Eye Allseer enters or you cast a noncreature spell, create a 1/1 white Bird creature token with flying.
Wander—{1}{U}, Exile two instant and/or sorcery cards from your graveyard.

Whenever a nontoken creature you control enters, if it wasn't cast from your hand, put a +1/+1 counter on that creature.
Wander {2}{W}

Flying, haste
As an additional cost to cast spells with flashback, you may pay {1}{R}. When you do, return Opal-Eye Phoenix from your graveyard to the battlefield.

Whenever you spend at least five mana to cast a spell, untap Opal-Eye Runeweaver.
{T}: Untap another target permanent not named Opal-Eye Runeweaver. Activate only as a sorcery.

When Opulent Roughrider enters or leaves the battlefield, surveil 1, then you may reveal the top card of your library. If that card has the same name as a permanent you control or a card in your graveyard, put it into your hand.
Wander {4}{U}{U}

Exile target creature or planeswalker. Its controller loses 2 life.

Counter target spell. That spell's controller reveals their hand. Choose any number of nonland cards from it. That player puts those cards on the bottom of their library in any order, then draws that many cards.

At the beginning of combat on your turn, if you've spent at least five mana to cast spells this turn, Peaktop Predator deals 2 damage to target player or planeswalker.

When Pensive Caldera enters, you may discard a card. If you do, draw a card.
{T}: Add {R}. Spend this mana only to cast artifact, instant, or sorcery spells.

Flash
When Permafrost Lynx enters, target creature you don't control doesn't untap during its controller's next untap step.

Defender
{2}{U}{U}: Permafrost Sentry becomes a copy of target Ruin you control.

Flash
When Permafrost Tiger enters, you may have it fight target creature that entered this turn.

Deathtouch
When Phyto's Offshoot enters, you may exile any number of permanent cards from your graveyard. When you do, target opponent reveals that many cards from their hand. You choose one of them. That player discards that card.

Whenever one or more cards leave your graveyard, put a +1/+1 counter on Phyto, Caverns Scourge, then each opponent loses life equal to half its power, rounded up. This ability triggers only once each turn.
{X}{X}{B}{G}, Exile Phyto, Caverns Scourge from your graveyard: Return X other target permanent cards from your graveyard to your hand.

As an additional cost to cast spells during an opponent's turn, you may pay {U} and reveal Promethean Jaxl from your hand. If you do, you get a lurk counter.
Flash
Promethean Jaxl enters tapped.
When Promethean Jaxl enters, you draw a card for each lurk counter you have, then you lose all lurk counters.

Enchant creature
Enchanted creature gets +1/+1 and can't block.
Wander {1}{B}

Flash
This spell costs {1} less to cast for each permanent with flash you control and each instant card in your graveyard.
Ward {2}

Counter target spell. Create an X/X blue and black Fish creature token, where X is the total number of permanents with flash you control and the number of instant cards in your graveyard.

Target creature you control gets +1/+1 until end of turn. Prevent all combat damage that other creatures would deal this turn.