msem-instigator

When Keen Redtail enters, create an Idol token. (It's an artifact with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)
When Keen Redtail dies, it deals damage equal to its power to any target.

Enchant land
Enchanted land has “{T}: Target creature gets -1/-1 until end of turn. Activate only as a sorcery.”

Destroy target monocolored permanent.
Reconstruct {4}{B}{G} (You may cast this from your graveyard for its reconstruct cost reduced by the mana value of a permanent you sacrifice as you cast it this way. Then exile this.)
You can only sacrifice permanents that share a color with No Good Deed Goes Unpunished to pay its reconstruct cost.

Return target creature card from your graveyard to the battlefield. If this spell was cast from a graveyard, you lose life equal to that creature's mana value.
Flashback {1}{B}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Whenever a creature in Heaven's Fire Ascetic's pack attacks, that creature deals 1 damage to defending player. (Two or more creatures you control with equal power are in a pack.)

Flying
When Ascended Explorer enters, return target creature card with mana value 2 or less from your graveyard to the battlefield.

Menace
{3}{R}: Transform Troublesome Throng. Activate only if it's attacking.

Target attacking creature gains double strike until end of turn. Arm it. (Create a colorless Equipment artifact token with “Equipped creature gets +1/+0” and equip {2}, then attach it to that creature.)

Counter target spell.
{1}{U}, Exile Refute from your graveyard: Draw a card.

{T}: Add {C}.
{1}, {T}: Add {G}{W}.

Flying
{1}{U}, Exile an instant card from your graveyard: Draw a card.
{1}{B}, Exile a creature card from your graveyard: Target creature gets -3/-3 until end of turn.
{1}{R}, Exile a sorcery card from your graveyard: Nefarox, Strifelord deals 3 damage to each opponent.

When Desperate Botanist enters, create a 0/1 green Plant creature token with “{T}: Add {G}.”
{5}{G}: Transform Desperate Botanist. Activate only if it's attacking.

Enspirit (As you cast this spell, you may exile a nonenchantment creature you control until this leaves the battlefield or fails to resolve. Reduce this spell's cost by the exiled card's mana value.)
At the beginning of your upkeep, create a token that's a copy of the enspirited card. It gains haste until end of turn. Exile it at the beginning of the next end step.

Once each turn, when you activate a nonmana ability, you may have Masked Servant get +1/+1 until end of turn.
{2}{W}: Untap target creature.

Return target creature card from your graveyard to the battlefield, then search target opponent's library for a creature card and put that card onto the battlefield under your control. Then that player shuffles.

{T}: Add {B} or {G}. You lose 1 life.

Harmony — Create a 1/1 white Bird creature token with flying.
{4}: Harmonize. (Trigger up to one harmony of one permanent you control.)

Foretell {3}{B} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)
Each opponent discards three cards.

When Gillo enters, reveal the top card of your library. If it's a land card, put it onto the battlefield tapped. If it's a creature card, put it into your hand.
As long as you control five or more creatures with different names, creatures you control get +1/+1 and have trample.

Legendary creatures you control get +1/+1.

Target creature gets -4/-4 until end of turn.

Search your library for three differently named noncreature, nonland cards with mana value 3 or less not named Chaos Is Your Redemption and exile them, then shuffle. If you exile three cards this way, cast one at random without paying its mana cost. Then shuffle the rest into your library.

Whenever you draw your second card each turn, put a +1/+1 counter on Ethereal Sneak.

{1}, {T}: Add one mana of any color.
Crew 1 (Tap any number of creatures you control with total power 1 or greater: This Vehicle becomes an artifact creature until end of turn.)

When Kaneh Headdress enters, create a 1/1 blue Advisor creature token, then scry 1.
Equipped creature gets +1/+1.
Equip {2}