msem-instigator

As an additional cost to cast this spell, sacrifice a noncreature permanent.
Search your library for a creature card with mana value equal to 1 plus the sacrificed permanent's mana value, put it onto the battlefield, then shuffle.

Exile target nonland permanent if its mana value is less than or equal to the greatest number of nonland permanents controlled by a single player.

Each player chooses a legendary permanent from among the nonland permanents they control, then sacrifices the rest.

Inferno Lash deals 2 damage to target creature or planeswalker. When it does, torment that permanent's controller. (They lose 3 life unless they discard a card or sacrifice a nonland permanent.)

Trample
Whenever a land you control becomes tapped, Loamwrecker gets +1/+1 until end of turn.

Tap a creature you control: Prevent the next 2 damage that would be dealt by target creature this turn.
Tap a Reflection creature you control: Prevent all damage that would be dealt this turn by a source of your choice.

Flying, vigilance
At the beginning of your end step, if a creature you control dealt combat damage to an opponent this turn, put a +1/+1 counter on Horizon Prophet.

Each creature has haste and “At the beginning of combat on your turn, choose an opponent at random. This creature attacks that player this combat if able.”

When Sandbluff Enforcers enters, detain target creature an opponent controls. (Until your next turn, that creature can't attack or block and its activated abilities can't be activated.)

Enchant creature
Enchanted creature gets -6/-0.
Mirage {1}{U} (You may cast this spell as though it had flash for its mirage cost. If you do, sacrifice it at the beginning of the next cleanup step.)

Enchant permanent
Whenever enchanted permanent becomes untapped, its controller gets a poison counter.

Enchant creature (Target a creature as you cast this. This card enters attached to that creature.)
Enchanted creature gets -1/-1.
Whenever enchanted creature attacks, its controller loses 2 life.

Flying
Whenever you cast a spell, draw a card, then put a +1/+1 counter on Maven of Perspective.

Bristling Skoki has first strike as long as it's attacking.
Whenever Bristling Skoki blocks a creature, you may have it deal damage equal to its toughness to that creature.

You may pay {2}{U}{U} and tap an untapped Wizard you control rather than pay this spell's mana cost.
Choose up to one target creature on the battlefield and up to one target instant or sorcery card in your graveyard. Return those cards to their owner's hands, then exile Ingenious Solution.

When Bearer of Tormented Truths enters, look at target player's hand. You may exile a nonland card from among them. If you do, that player draws a card.
You may play cards exiled with Bearer of Tormented Truths, and you may spend mana as though it was mana of any color to cast them.

Tizzanier Tidehunter can't be blocked as long as you control another Merfolk.

{1}{U}, {T}: Draw a card, then discard a card. You get a glory counter. (You lose glory counters before life. A player with ten or more glory counters wins the game.)
{U}, {T}: Draw a card. Only activate this ability if you are glorious.

Reach
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Reach (This creature can block creatures with flying.)
Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

Tumblewalker has vigilance as long as you control another Scarecrow.

Other creatures you control get +2/+0 and have menace.
Whenever another creature you control dies, if it wasn't sacrificed, sacrifice a creature.

Flying
Div of the Endless Thought has all activated and triggered abilities of all other permanents on the battlefield.

When Temporal Rift enters, exile target creature an opponent controls until Temporal Rift leaves the battlefield.
Whenever you aetherize, you may return Temporal Rift to its owner's hand.

When Enter the Wormhole enters or leaves the battlefield, draw a card.
Whenever you cast a noncreature spell, target player mills a card.