msem-instigator

Whenever another creature you control dies, put a +1/+1 counter on Ruthless Weichafe and you lose 1 life.
Whenever Ruthless Weichafe attacks, if its power is 4 or greater, it gains lifelink until end of turn.

Counter target spell unless its controller pays {3}. That spell's controller mills three cards.

Counter target spell unless its controller pays {1}.
Create a colorless artifact token named Lotus Petal with “{T}, Sacrifice this artifact: Add one mana of any color.”

Target creature can't block this turn.
Inscribe {1}{R} ({1}{R}: Exile this card from your hand inscribed on a creature you control. Whenever that creature attacks, its controller may cast a copy of the inscribed card without paying its mana cost. Inscribe only as a sorcery.)

Frenzy 2 (Whenever this creature attacks and isn't blocked, it gets +2/+0 until end of turn.)

When Okus, the Fabulous Hat enters, gain control of target creature or planeswalker for as long as you control Okus.
[+1]: You may create a blue Aura enchantment token named Fancy Hat with enchant creature and “Enchanted creature gets -2/-0.”
[–2]: Target player loses life equal to the number of enchantments you control and you gain that much life.

Put a +1/+1 counter on target creature. Prevent all combat damage other creatures would deal this turn.

When Colony Queen enters, create three 1/1 green Insect creature tokens.
Insect tokens you control have flying and deathtouch.

Enchant land
When Unexplored Regions enters, draw a card.
Enchanted land is an artifact in addition to its other types and has “{T}: Add one mana of any color.”

Hexproof
Whenever Twinning Psionic harnesses an instant or sorcery spell, you may copy that spell. If you do, you may choose new targets for the copy.

Flash
When Odaya Magistrate enters, you may counter target noncreature spell.

{T}: Add {C}.
{1}, {T}, Exile Exotic Isle: Search target opponent's library for a land card and put it onto the battlefield tapped under your control, then that player shuffles. Activate only as a sorcery.

({T}: Add {W}.)
Bustling Docks enters tapped.
{W}, {T}, Reveal a white card from your hand: Target creature gets +1/+0 until end of turn.

[+1]: Create a 1/1 blue Dragon creature token with flying and “This creature can't attack unless you control a nontoken Dragon.”
[–2]: Flynn deals damage to target creature or planeswalker equal to the total power of Dragons you control.
[–5]: You get an emblem with “Dragon spells you cast cost {U}{R} less to cast and have flash.”

Trample
When Sealer of Pacts enters, sacrifice any number of permanents, then draw that many cards.

Target blocking creature gets +7/+7 and gains indestructible until end of turn. You get a glory counter. (You lose glory counters before life. A player with ten or more glory counters wins the game.)

Reach

When Colony Soldier enters, create a 1/1 green Insect creature token.

Scion of Belmord has lifelink as long as it's embattled. (A creature is embattled if it has a counter on it or a permanent you control attached to it.)

Whenever you make first contact, target creature you control can't be blocked by Humans this turn. (You make first contact the first time each turn you cast a spell with a name not in your graveyard or control already.)

When Bjarndyr Militant enters, return target Aura card or card with fabled from your graveyard to your hand.

First strike, haste
At the beginning of each end step, if a player lost life this turn, put a +1/+1 counter on Animara, Last of the Fell.

Once each turn, when a creature you control becomes tapped, you may untap that creature and tap up to one target creature.

(As you complete a condition, decode it. After all are decoded, you solve the mystery and transform this.)
When Mystery of the Crashed Craft enters, create two 1/1 red Alien creature tokens with “This creature can't block.”
{MG}—You cast an instant spell.
{MG}—You cast a sorcery spell.

Whenever Knight of the Staff deals combat damage to a player, you may sacrifice it. If you do, search your library for a blue legendary creature card, reveal it, put it into your hand, then shuffle.