Search your library for a basic land card, reveal it, put it into your hand, then shuffle. Scry 1.

Target creature you control gains deathtouch until end of turn. When that creature dies this turn, create a 2/2 black Zombie creature token.

Target creature gets +1/+0 and gains first strike until end of turn. It gets an additional +2/+0 until end of turn for each time you've amped it up this turn.

Whenever Rooftop Slink deals combat damage to a player, you may have each player discard a card.
Cybersoul {2}{B}

Enchant creature
Enchanted creature gets -1/-1.
Sacrifice an artifact: Destroy enchanted creature.

Secluded Hangar enters tapped unless you control a basic non-Forest land.
{T}: Add {G}.
{2}, {T}: Put a +1/+1 counter on target creature that entered this turn.

Whenever a basic land you control enters, put a +1/+1 counter on Seeker of New Horizons. If you control seven or more lands, bless that land.

Shell Cove enters tapped.
{T}: Add {G} or {U}.
{9}{G/U}: Shell Cove becomes a 7/7 green and blue Leviathan creature with ward {3} until end of turn. It's still a land. This ability costs {X} less to activate, where X is your devotion to green and blue. Activate only once each turn.

At the beginning of combat on your turn, you gain 1 life. If you control three or more Shrines, instead you gain 3 life.

{2}{B}: Return target creature card with mana value X or less from your graveyard to the battlefield, where X is the number of Shrines you control. Activate only once each turn and only during your turn.

At the beginning of combat on your turn, each opponent mills two cards. If you control three or more Shrines, you may exile one of those cards. You may cast that card as long as it remains exiled, and mana of any type can be spent to cast that spell.

Sillaman District enters tapped unless you control a Forest, a Plains, and an Island.
{T}: Add {G}, {W}, or {U}.

Double strike

Silvereye Scout can't be blocked except by three or more creatures.

Flying, trample, lifelink
Ward—Pay 7 life.

Flash
Flying
When Sleeper Strix enters, tap up to one target creature.
Whenever you surveil, you may return Sleeper Strix to its owner's hand.

When Slumbering Grove enters, search your library for a basic land card, reveal it, put it into your hand, then shuffle.
Spellcharge 8

When Soul-Guide Lantern enters, exile target card from a graveyard.
{T}, Sacrifice Soul-Guide Lantern: Exile each opponent's graveyard.
{1}, {T}, Sacrifice Soul-Guide Lantern: Draw a card.

When Sparks of a Revolution enters, create a 1/1 colorless Soldier creature token. It gains haste until end of turn.
Three or more sources you controlled dealt damage this turn.
A source you controlled dealt 3 or more damage this turn.

Counter target activated or triggered ability from a nonland source. If a creature's ability is countered this way, you may pay {1}{C}. If you do, exile that creature.

Whenever a Ruin you control becomes spellcharged, put a +1/+1 counter on Speaker of the Forebears.
Sacrifice Speaker of the Forebears: Add an amount of {R} equal to the number of +1/+1 counters on it.

Flying
Sacrifice Spellbane Sentinel: Counter target noncreature spell unless its controller pays {1}.

Whenever you amp it up, target creature gets +1/+1 until end of turn. If this is the second time this ability has resolved this turn, put a +1/+1 counter on that creature instead.

Spiraling Canyon enters tapped unless you control a basic Mountain or basic Plains.

When this creature transforms into Splintered Soul, create X 3/1 colorless Cyborg Soldier artifact creature tokens.
Whenever Splintered Soul or another Cyborg you control dies, you gain 1 life.