msem-instigator

Menace
Whenever Wightclaw deals combat damage to a player, that player discards a card and you draw a card.

Lifelink
{1}{W}, Exile this card from your graveyard: Target Knight or Soldier seeks secrets. (Give it that Oath Aura. Fulfill it by attacking with it and two or more other creatures to draw a card.)

First strike

Put two +1/+1 counters on target creature. Untap that creature.

Flying
Welkin Tern can block only creatures with flying.

Flying, lifelink
{2}{W}{W}, Exile Archon of Sunrise from your graveyard: Create a token that's a copy of it, except it's an Aura enchantment with enchant creature and “Enchanted creature gets +4/+4 and has flying and lifelink.” Activate only as a sorcery.

When Bitter Pact enters, destroy target nonbasic permanent.
All permanents and players lose hexproof, indestructible, and protection and can't have or gain hexproof, indestructible, or protection.

Reach
If a creature is attacking you and you control a Centaur, you may cast Qilan Archer without paying its mana cost and as though it had flash.

Haste
When Horse Thief enters, you may gain control of target creature or Steed until end of turn. It gains haste until end of turn. If it's a Steed, attach it to Horse Thief.

Reach
When Automated Overwatch enters, create a Function token with “If this spell would create one or more tokens, it creates twice that many of those tokens instead.” (It's an enchantment. As you cast an instant or sorcery spell, sacrifice any number of Functions to add their effects to that spell.)

Sacrifice a creature: Put a +1/+1 counter on Endak City Slavedriver. Activate only as a sorcery.

Whenever a creature you control dies, put a +1/+1 counter on Agent of Andazir.

Advance {3}{W}{W} (Cast this for {3}{W}{W} to advance it as it enters. {3}{W}{W}: Advance this as a sorcery.)
Whenever Inconspicuous Loxodon advances, search your library for an Equipment card, put it onto the battlefield, then shuffle.
As long as Inconspicuous Loxodon is enchanted or equipped, he's a 5/5 legendary Elephant Rogue named Agent E.

You may have Enthusiastic Double enter as a copy of any permanent on the battlefield, except it's 4/4, it's a creature in addition to its other types, and it has haste.

({T}: Add {R} or {G}.)
Highland Vale enters tapped.

When Gate of Realms enters, you may search your library for a land card, reveal it, and put that card into your hand. If you do, shuffle.
{10}, {T}: Gate of Realms deals 3 damage to any target. This ability costs {1} less to activate for each different name among lands you control.

Menace
When Blackmoat Bully dies, put a +1/+1 counter and a menace counter on target creature you control.

{T}, Pay 1 life: Add {G} or {U}.
{2}, {T}, Sacrifice Alchemist's Laboratory and another permanent: Draw a card. Activate only during your turn.

When Dutiful Camel enters, put a +1/+1 counter on target creature you control.

Menace
Foresight — Whenever you draw your second card each turn, target player loses 2 life and you gain 2 life.

Choose one —
• Prevent all damage that would be dealt by creatures this turn.
• Harmonize twice. (Trigger up to one harmony of a permanent you control.)

Enchant creature
Enchanted creature has frenzy 3. (Whenever that creature attacks and isn't blocked, it gets +3/+0 until end of turn.)

Search your library for an enchantment card, reveal it, put it into your hand, then shuffle.

Trial 3 (As you cast this spell, an opponent of your choice may pay 3 life. If they don't, they fail the trial.)
Target creature gets +1/+0 and gains menace until end of turn. If the trial was failed, other creatures you control gain menace until end of turn.

When Frontier Scouts enters, reveal the top card of your library. If it's a land, put it onto the battlefield tapped.