msem-instigator

Petty Destruction can't be countered.
Destroy target nonbasic permanent.

Target creature you control gets +2/+0 until end of turn. It fights target creature you don't control. (Each deals damage equal to its power to the other.)

Enchant creature you control
Enchanted creature has lifelink.
When Phantasmal Possession enters, exile target creature an opponent controls until Phantasmal Possession leaves the battlefield.

Whenever a nontoken creature you control dies, you may exile it. If you do, create a token that's a copy of it except it's a 1/1 white Spirit creature in addition to its other types and colors.
{2}{B}, Sacrifice a creature: Each opponent loses 1 life and you gain that much life.

Tap target creature. Prevent all combat damage that creature would deal this turn. It doesn't untap during its controller's next untap step.

Enchant creature
When Philosophical Conundrum enters, scry 1.
Enchanted creature can't attack or block.

Whenever a source you control deals damage to an opponent this turn, exile the top card of your library. You may play it this turn.

{T}, Sacrifice Phosphorescent Ravine: Search your library for an Island or Swamp card and put it onto the battlefield tapped, then shuffle.

Enchant creature
When Photon Barricade enters, draw a card.
Enchanted creature gets +1/+1 and can't attack.

{2}, {T}, Exile a card from your graveyard: Draw a card.

Return X target creature cards with mana value 3 or less from your graveyard to the battlefield, then choose one of them and exile the rest.

You draw two cards, lose 2 life, and create a Gold token. (It's an artifact with “Sacrifice this artifact: Add one mana of any color.”)

Create a token that's a copy of target permanent you control, except it isn't legendary. Then put Picture Perfect on the bottom of its owner's library if you cast it from exile.
Leitmotif (If you cast this spell from your hand, exile it as it resolves. When you next cast a spell that shares a color with this card, you may cast this from exile without paying its mana cost.)

[+1]: Create a 1/1 white Cat creature token with lifelink.
[–1]: When you next activate a nonmana ability of target permanent this turn, copy that ability. You may choose new targets for the copy.
[–7]: Exile up to seven target permanents. Return those cards to the battlefield under their owner's control at the beginning of the next end step.

Archive 2 (As this enters, shuffle the top two cards of your main library into a new face up library. Sacrifice this after the archived library is empty.)
{R}{W}: Put a nontoken artifact or creature you own on the bottom of the archived library. Create a token that's a copy of it.

Codex — Eleventh Hour Breakthrough; Mentorb; Ostracizer Orb; Possibility Engine; Sealed Riftway; Self Replication. (As this enters, conjure its contents into a shuffled face-up additional library.)
{T}, Sacrifice an artifact: Draw a card from the codex's library.

[+1]: Artifact creatures you control get +1/+1 and gain haste until end of turn.
[–X]: You may cast an artifact card with mana value X or less from your hand without paying its mana cost. If it has {X} in its cost, {X} is X.
[–6]: Choose a number. For each artifact you control with the mana value equal to the chosen number, create a token that's a copy of it.

Each opponent loses 1 life. Whenever you cast another spell this turn, each opponent loses 1 life.
Acquiesce (If you cast this spell from your hand, exile it as it resolves. When one or more creatures you control deal combat damage to an opponent, you may cast this card from exile without paying its mana cost.)

Destroy target creature or planeswalker. That permanent's controller loses 3 life unless that player sacrifices a nonland permanent or discards a card.

Enchant creature
When enchanted creature dies, you draw X cards, where X is its toughness. Then you may put a land card from your hand onto the battlefield.

Discard your hand, then for each creature you control that dealt combat damage to a player this turn, draw a card and create a Treasure token.
{1}{R}, Tap an untapped Pirate you control, Discard Pieces of Eight: Create a 2/1 black and red Cat Pirate creature token with menace.

Pierce the Sky deals 7 damage to target creature with flying.

Choose one —
• Counter target spell unless its controller pays {X}.
• Counter target spell with mana value X.

Adjudicate, then target creature gets +1/+1 until end of turn for each Aura you control. (Create a white Aura enchantment token with enchant creature and “Sacrifice this token: Untap enchanted creature” attached to target creature.)

Unattach all Equipment from target creature. Piercing Blow deals 3 damage to that creature.