msem-instigator

{T}: Add {C}.
{3}, {T}, Sacrifice Abandoned Sanctuary: Search your library for a land card with a basic land type and put it onto the battlefield tapped, then shuffle.

Until end of turn, target creature becomes black, gets +1/+0, and gains indestructible.

Non-Avatar creatures can't attack you or planeswalkers you control unless their controller pays {2} for each of those creatures.

({T}: Add {G} or {W}.)
Whenever Resplendent Substratum becomes tapped, you lose 1 life unless you control two or more basic lands.

Haste
When Rainy Night Lovers enters, look at the top four cards of your library. You may cast a red instant or sorcery spell with mana value 1 from among them without paying its mana cost. Then put the rest on the bottom of your library in any order.

When Remnant of the Hunt leaves your graveyard, create a token that's a copy of it, except it has no mana cost.
Revive {3}{G}{G} ({3}{G}{G}, Exile this card from your graveyard: Create a token that's a copy of this card, except it has no mana cost. Activate this ability only any time you could cast a sorcery.)

Menace, haste
Whenever Manic River-Fishers attacks, you may search defending player's library for an instant or sorcery card that shares a name with a card in their graveyard and cast it without paying its mana cost. That player shuffles.

Spells you cast from anywhere other than your hand cost {1} less to cast.
At the beginning of combat on your turn, another target Pirate or Rogue you control gets +X/+0 and gains haste until end of turn, where X is the number of noncreature spells you've cast this turn. That creature can't be blocked this turn.

When Thailen's Guard dies, you gain 2 life and scry 1. (To scry 1, look at the top card of your library. You may put that card on the bottom of your library.)

Target permanent becomes a colorless Mountain land until the beginning of your next upkeep.

Each player exiles up to X cards from their graveyard. Then each player loses life, discards cards and sacrifice creatures equal to X minus the number of cards that player exiled this way.

Enchant player
At the beginning of enchanted player's end step, if they cast a spell this turn, they lose 1 life.

Copy target instant or sorcery spell you control. You may choose new targets for the copy.

Target creature you control gains erratic until end of turn. You may have it fight another target creature. (When this creature dies, reveal the top four cards of your library. Put a creature card that costs less than this revealed this way onto the battlefield and the rest on the bottom of your library in any order.)

Haste
Whenever this creature attacks, you may discard a card. If you do, draw a card.

Exile the top two cards of your library. Until end of turn, you may play cards exiled this way. If an instant or sorcery spell cast this way would deal damage to a player or planeswalker, it deals double that damage instead.

Exile target permanent you control, then return that card to the battlefield under your control.

Rouse 4. (Distribute four +1/+1 counters among permanents you control. If they aren't creatures, tap them and they become 0/0 creatures in addition to their other types.)

Enchant creature
When this enchantment enters, surveil 2.
Enchanted creature gets +2/+2 and has lifelink.

{T}: Mill three cards. Scry 1.
{1}, Sacrifice Consecrated Altar: Counter target spell or ability that targets you or one or more cards in your graveyard.

Concord — As long as there are four or more card types among permanents you control, you may cast the first spell you cast each turn without paying its mana cost.

When Weedy Wanderer leaves the battlefield or phases out, put a +1/+1 counter on a creature you control.

Trample
At the beginning of your upkeep, return another creature you control to its owner's hand.

Whenever a nontoken creature you control dies, create a 1/1 black Spirit creature token with flying.
[+1]: Each opponent loses 2 life and you gain 2 life.
[–2]: You may sacrifice a creature. When you do, destroy target nonland permanent.

When Landbound Ritualist enters, you may put a land card from your hand or graveyard onto the battlefield tapped.