msem-instigator

Haste
When Jetskate enters, if you've drawn two or more cards this turn, it deals 2 damage to any target.
Cycling {R} ({R}, Discard this card: Draw a card.)

When Jinyu Mirror-Blade enters, you may exchange its base power with another target creature's base power until either leave the battlefield.

Johanna, Skarvith Marshal has first strike as long as it's attacking.
Whenever you attack, you may pay {X}{R/W}{R/W}. When you do, put a +1/+1 counter on each of up to X target attacking creatures. Those creatures gain first strike until end of turn.

Choose two. You may choose the same mode twice —
• Create a 1/1 green Insect creature token.
• Put a +1/+1 counter on target creature you control.

Creatures you control get +1/+1 and gain flying and lifelink until end of turn.

Trample
{1}{R}: Each attacking creature you control with trample gets +1/+0 until end of turn.

When Journey through Kitasan enters, draw a card, then choose a creature card name.
{1}{W}: Put a +1/+1 counter on each creature you control with the chosen name. Activate only as a sorcery.

When Journey through Masamori enters, draw a card, then choose a creature card name.
Creatures you control with the chosen name have “{T}: Add one mana of any color.”

When Journey through Moranai enters, draw a card, then choose a creature card name.
Creatures you control with the chosen name have haste and “{R}: This creature gets +1/+0 until end of turn.”

When Journey through Odaya enters, draw a card, then choose a creature card name.
Creatures you control with the chosen name can't be blocked.

When Journey through Uwaito enters, draw a card, then choose a creature card name.
Whenever a creature you control with the chosen name dies, each opponent discards a card.

When Journey to the Otherworlds enters, draw a card, then choose a creature card name.
Whenever a creature you control with the chosen name attacks, you may aetherize it. (To aetherize, create a token that's a copy of it, then exile that token.)

When Journey to the Syzygy Spire enters, draw a card, then choose a creature card name.
Whenever a creature you control with the chosen name deals combat damage to a player, draw a card.

When Journey to the Zhedina enters, draw a card, then choose a creature card name.
Whenever a creature with the chosen name you control deals damage to a player, put a +1/+1 counter on it.

Put target creature or planeswalker on the bottom of its owner's library. Its controller may scry 1.

Whenever Journeying Giftbearer or another nontoken creature you control enters, create a green and white Aura enchantment token named Wild Boon attached to that creature. The token has enchant creature and “Enchanted creature gets +1/+1.”

As Joyous Chromatelk enters, choose a color.
All cards that aren't on the battlefield, spells, and permanents are the chosen color in addition to their other colors.
{T}: Add one mana of the chosen color.

Draw three cards, then exile three cards from your hand. Until the end of your next turn, you may play those cards.

Whenever a land you control enters, create a 1/1 colorless Servo artifact creature token.
{4}{G}{W}: Put a +1/+1 counter on each creature you control. They gain trample until end of turn.

Double strike, menace, trample
At the beginning of your end step, sacrifice Juddering Mishap unless you've cast a spell with no creature types this turn. (Noncreature spells have no creature types.)

Choose target attacking or blocking creature. Scry 3, then reveal the top card of your library. Judge Unworthy deals damage equal to that card's mana value to that creature.

When Judge of Clans enters, adjudicate. (Create a white enchantment Aura token with enchant creature and “Sacrifice this token: Untap enchanted creature.” attached to target creature.)
{T}: Add one mana of any color.

Menace
Swampcycling {1}, forestcycling {1} ({1}, Discard this card: Search your libary for a Swamp or Forest card, reveal it, put it into your hand, then shuffle.)

{1}{R}: Exile the top card of your library. If it's a creature card, you may play it until the end of your next turn.
{4}{W}: Put two +1/+1 counters on target creature.

Jungle Shrine enters tapped.
{T}: Add {R}, {G}, or {W}.