msem-instigator

Lifelink
Converge — When Adapted Explorer enters, it deals X damage to up to one target tapped creature, where X is the number of colors of mana spent to cast it.

Creatures can't attack you or planeswalkers you control unless their controller pays {X} for each of those creatures, where X is the number of attacking creatures.

First strike

Each opponent sacrifices a creature that dealt damage this turn. You gain 2 life, then abound. (To abound, you may cast a spell that costs less than this from your hand without paying its mana cost.)

Enchant opponent
The first time enchanted player chooses targets each turn, reselect each of those targets at random.

{T}, Sacrifice Escape Hatch: Return target creature you control to its owner's hand.

As an additional cost to cast this spell, pay {4} or sacrifice a creature.
Target creature gets -13/-13 until end of turn. If that creature would die this turn, exile it instead.

Destroy target creature or planeswalker. If you controlled a black legendary creature or planeswalker as you cast this spell, that permanent's controller loses X life and you gain X life, where X is that permanent's mana value.

Search your library for a basic land card, reveal it, put it into your hand, then shuffle. Create a 1/1 green Elf creature token.

(Transform this if it's not attached to a creature. Pay {1}{W} as a sorcery to unattach it.)
Enchant creature you control
Mount of Heroes's rider gets +2/+1.
Sacrifice Mount of Heroes: Counter target spell that targets you or Mount of Heroes's rider.

{3}, {T}: Return target creature card from your graveyard to the battlefield under target player's control. That creature deals damage equal to its power to that player.

Target player sacrifices a creature. Fateseal 1. (To fateseal 1, look at the top card of an opponent's library, then you may put it on the bottom of that player's library.)

Enchant creature
Enchanted creature gets +2/+2 for each other enchantment you control.

Golden age (If you cast an instant or sorcery spell, activated a nonmana ability, and attacked this turn, enter a renaissance for this game.)
{3}{W}: You gain 1 life.
Sponsor of the Folded Fan gets +2/+0 as long as you're in a renaissance.

Flash
Vanishing 3 (This permanent enters with three time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)
When Judge's Decree enters, exile another target spell or nonland permanent. When Judge's Decree is no longer on the battlefield, the exiled card's owner may cast that card without paying its mana cost.

Syndicate Sycophant can't block.
When a creature you control scavenges Syndicate Sycophant, you may search your library for a card named Syndicate Sycophant, reveal it, put it into your hand, then shuffle.
Scavenge {2}{B} ({2}{B}, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)

{1}{B}, Mill three cards: Return Dredging Aberration from your graveyard to your hand.

Enchant opponent
At the beginning of enchanted player's end step, they discard a card.

Menace
At the beginning of your end step, if you gained or lost life this turn, look at the top card of your library. You may reveal it and put it into your hand. If you do, you lose life equal to its mana value. If you don't, you may put it into your graveyard.

Reach
When Risti Watchkeeper enters, rediscover a creature card. (Look at the top card of your library. You may reveal it and put it into your hand if it's a creature card. Otherwise, put it back or into your graveyard.)

Spells you cast without trial have trial 1. (As you cast a spell with trial 1, an opponent of your choice may pay 1 life. If they don't, they fail the trial.) (As you cast this spell, an opponent of your choice may pay 1 life. If they don't, they fail the trial.)
Whenever an opponent fails a trial, you may discard a card. If you do, draw a card.

Put a lifelink counter on target creature you control. It deals damage equal to its power to another target creature or planeswalker.

Flash
When Dehmi, Origin Seeker enters, counter target spell an opponent controls unless that spell's controller has you create X 1/1 red Elemental creature tokens, where X is that spell's mana value.

Choose any number of target nonland permanents each controlled by different players. For each of those permanents, return it to its owner's hand. If you returned a permanent you controlled this way, create a 3/3 green Plant Elemental creature token with reach.

Wild Pyromancy deals 2 damage to each creature, player, and planeswalker. If you cast this spell during your main phase, Wild Pyromancy deals 3 damage to each creature, player, and planeswalker instead.