msem-instigator

When Chikyu Champion enters, choose up to one for each land you control. Create a creature token for each of the chosen characteristics.
• 3/3 red Elemental Mouse with haste.
• 3/3 white and blue Fox with vigilance.
• 4/4 green Plant Dinosaur with trample.
• 4/4 red Dragon with flying.
• 4/4 blue Turtle with hexproof.
• 5/5 white Bear Beast.

Purge, then you may pay 2 life. If you do, purge again. (To purge, exile two cards that share a type from graveyards. If you do, draw a card.)

{B}: Treacherous Shade gets +1/+1 until end of turn.
{1}{B}{B}: Treacherous Shade gets +3/+3 until end of turn.

When Smoldering Husk dies, it deals 2 damage to any target.
{2}{R}: Smoldering Husk gets +2/+0 until end of turn.

Whenever you gain life for the first time each turn, draw a card.
{3}{G}{W}: You gain life equal to the greatest toughness among creatures you control.

When Ethereal Pact enters, each player shuffles their hand and graveyard into their library, then draws seven cards.
Each player can't cast more than one spell each turn.

Prowess
Whenever you cast a noncreature spell, target creature can't block this turn.

Desolate Path enters tapped unless you control one or fewer other lands.
{T}: Add {W} or {B}.
Cycling {2} ({2}, Discard this card: Draw a card.)

Slipstream (This creature can't be blocked as long as only creatures with slipstream are attacking.)
Shimmer (Whenever this creature attacks, create a tapped and attacking token that's a copy of it. Exile the token at the beginning of the next end step.)

Indestructible
As long as your devotion to black is less than five, Erebos isn't a creature.
Other creatures you control dying causes abilities of that creature to trigger as though it entered.
{2}{B}: Each opponent loses 1 life. You gain life equal to the life lost this way.

Flying, haste
Whenever a nonbasic land becomes tapped, it deals 2 damage to its controller.
Whenever Kaor Awoken attacks, it gets +1/+0 until end of turn for each other Dragon you control.

Put a +1/+1 counter on target creature.
Flashback {1}{G} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Whenever Morbid Mimic enters or attacks, exile up to one target creature card from a graveyard.
Morbid Mimic has all activated abilities of cards exiled with it.

Menace
Whenever Akoum Trailblazer deals combat damage to a player, you may discard a card. If you do, draw a card.
Whenever you discard a card, you may pay {R}. If you do, create a 1/1 red Goblin creature token.

Whenever a creature dies, Pakka, the Shadowcloak deals 1 damage to each opponent.

When Valley's Majesty enters, draw a card, then choose a card name.
Nonbasic lands you control with the chosen name have “{T}: Add two mana of any one color.”

{T}: Quill Sniper deals 1 damage to any target if it's an opponent or if you control a storied permanent. (Enchantments and legendary permanents are storied.)

When Dreamsight Well enters, shuffle any number of cards you own from outside the game into your library.
Whenever you cast a creature spell, if you have more cards in your library than each opponent, draw a card.

Equipped creature gets +1/+1 for each Equipment attached to it.
Whenever an Equipment you control enters, attach it to equipped creature.
Equip {2}

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

{T}: Add {C}.
{T}, Pay 1 life: Add {G}.
{G}, {T}: Add one mana of any color.

{T}: Add {C}.
{2}, {T}: Add two mana in any combination of colors.

When Compose from Dreams enters, you may cast any number of cards named Fatigue from your hand and graveyard without paying their mana costs.
Whenever you cast a spell, each opponent loses 1 life. Then you may draw a card if that spell wasn't cast from your hand. Then add {U}{B}{R} if you don't own that spell.

Whenever a creature dies, exile it.
Hiroto Jaakuna has all activated abilities of creature cards exiled with Hiroto Jaakuna.

Skip your draw step.
At the beginning of your end step, discard a card. If you do, create a 4/4 white Angel creature token with flying. If you can't, sacrifice Mark of Hubris.