msem-instigator

Abandoned Hideout enters tapped if you control another nonbasic land.
{T}: Add {U} or {R}.

Look at the top two cards of your library. Put one of them into your hand and the other on the bottom of your library.

Return target nonland permanent you control and target nonland permanent you don't control to their owners' hands.

Sunny Dunes enters tapped unless another player controls a land that could produce {R} or {W}.
{T}: Add {R} or {W}.

Cleansing Brimstone deals 2 damage to any target. If a creature or planeswalker dealt damage this way would die this turn, exile it instead.

Counter target spell unless its controller pays {2}. If that spell targets you or a permanent you control, counter that spell instead.

Enchant creature
Enchanted creature gets +1/+1.
{W}: Enchanted creature gains vigilance until end of turn.
{1}{W}: Enchanted creature gains first strike until end of turn.

Lush Coast enters tapped.
{T}: Add {G} or {U}.
{1}, {T}: Add one mana of any color.

Look at the top five cards of your library. You may reveal a creature card from among them and put it into your hand. Put the rest on the bottom of your library in any order.

Somberwald Slaughterer can't be blocked by creatures with power 2 or less.
At the beginning of your end step, if Somberwald Slaughterer didn't attack this turn, transform it.

Counter target spell if you have more cards in your graveyard than that spell's controller.

Counter target creature spell, planeswalker spell, or activated ability.

Whenever a Soldier you control enters, you may untap Sandbluff Irregular.

Yi Cang, Thief of Blessings enters with a +1/+1 counter on them.
{1}: Yi Cang becomes a copy of target creature in their pack, except their name is Yi Cang, Thief of Blessings, they're legendary in addition to their other types, and they have this ability. (Two or more creatures you control with equal power are in a pack.)

Trample
Frontier Hoof gets +1/+1 for each other Centaur you control.

Whenever another creature enters, you gain 1 life.

When Abyssal Nightcaster enters, each player exiles a card from their hand.
When Abyssal Nightcaster dies, you may play cards you don't own from exile this turn.

Dutiful Chasqui gets +2/+1 as long as you control two or more other creatures that share a name with it.
A deck can have any number of cards named Dutiful Chasqui.

If a source would deal damage to a creature in Cascading Zhenzu's pack, prevent 1 of that damage. (Two or more creatures you control with equal power are in a pack.)
{U}: You may switch Cascading Zhenzu's power and toughness until end of turn.

Flash
When Total Surveillance enters, draw a card.
Whenever you cast another spell with flash or an instant, you may pay {1}. If you do, create a 1/1 colorless Drone artifact creature token with flying.

Look at the top two cards of target player's library. Put one of those cards on the bottom of their library and the rest on top.
Fuse (You may cast one or both halves of this card from your hand.)

Menace, lifelink
Whenever a creature enters under an opponent's control, you may have that player lose 1 life.

Target noncreature artifact you control becomes a 0/0 artifact creature. Put three +1/+1 counters on it.

As long as you control three or more creatures with the same name, Scouts and Wizards you control can't be blocked.
A deck can have any number of cards named Ch'aska Walla Chasqui.

At the beginning of your upkeep, you may return a nontoken creature you control to its owner's hand. If you do, create a 2/2 green Elk creature token.