msem-instigator

Enchant artifact or creature
Enchanted permanent doesn't untap during its controller's untap step.
Whenever you make first contact, scry 1. (You make first contact the first time each turn you cast a spell with a name not in your graveyard or control already.)

Cadence (Whenever you cast a spell, if its mana value is greater than this creature's power, put a +1/+1 counter on this creature.)
Creatures with power less than Olten Survivalist's power can't block creatures you control.

When Enhance Armor enters, return an enchantment card from your graveyard to your hand.
Whenever you cast an enchantment spell, put a +1/+1 counter on a creature you control.

Puzzlebox (Begin the game with this and another card you own from outside the game in the command zone, locked. That card is face down until you unlock this.)
{2}, Discard your hand: Unlock Traitor's Gambit. If the revealed card is red, put it into your hand. Otherwise, put it on top of your library.

Target creature gets +1/+3 until end of turn. (Then exile this card. You may cast the creature later from exile.)

Sacrifice any number of lands. Search your library for that many basic land cards, put them onto the battlefield, then shuffle.

Whenever this creature enters, attacks, or leaves the battlefield, choose one that hasn't been chosen.
• Return another target nonland permanent to its owner's hand.
• Draw two cards.
• Create three 1/1 blue Bird creature tokens with flying.
• Add {U}{U}{U}{U}. You can't spend this mana to cast creature spells.

Merciless Champion can't block unless you control another Knight or Soldier.

When Fatethief dies, put the bottom card of your library into your hand.
Revive {2}{B}{B} ({2}{B}{B}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

Draw two cards.
Cycling {2} ({2}, Discard this card: Draw a card.)

Humble Fieldhand gets +1/+0 and has vigilance as long as you control an Equipment.

Volcanic Catastrophe deals 3 damage to any target. If a permanent dealt damage this way would die this turn, instead exile it and its controller's graveyard.

Siphon (Each -1/-1 counter you put on your creatures up to their remaining toughness while casting this pays for {1}.)
When this enchantment enters, exile target nonland permanent an opponent controls until this enchantment leaves the battlefield.

Destroy target noncreature permanent. Its controller may search their library for a basic land card, put that card onto the battlefield tapped, then shuffle.

If you would draw one or more cards, draw that many cards plus one instead.
When Unleashed Mindboggler dies, return it to the battlefield (front face up).

Flying
When Namuzzar's Iterator enters, you may return an artifact or enchantment you control to its owner's hand.

Repurposed Construct enters tapped.
{T}: Add {B} or {G}.
{B}{G}, {T}, Sacrifice Repurposed Construct: Conjure a card named Data-Point into your hand. (It's a sorcery that costs {2} with “Draw a card.”)

Whenever you cast a white spell, choose up to X, where X is the number of white mana symbols in that spell's mana cost —
• Return target creature card with mana value 1 or less from your graveyard to the battlefield.
• Creatures target player controls get +1/+1 until end of turn.
• Target player gains 2 life.
• Tap target creature.

Reach
{4}{B}: Each opponent loses 2 life and you gain 2 life.

When Fallen Dynasty Jailer enters, target opponent exiles a card from their hand. When Fallen Dynasty Jailer is no longer on the battlefield, the exiled card's owner puts it on the top or bottom of their library.

Hexproof
At the beginning of your upkeep, put a card from your hand on top of your library. You may shuffle.
{1}: Look at the top three cards of your library, then put them back in any order.
{2}{U}: Draw a card.

Create three 1/1 green Saproling creature tokens.

Creatures you don't control get -1/-0 as long as their controller is cursed.

Gain control of target nonland permanent an opponent controls. Its owner reveals cards from the top of their library until they reveal a card that shares a type with that permanent, then puts it onto the battlefield and shuffles.

Whenever Lackeybot deals damage to a player, choose an artifact card with mana value X or less at random, where X is the amount of damage dealt. You may create a token that's a copy of that card.